Dealing with Household Pests in Japan: Cockroaches, Mosquitoes and Seasonal Bugs
Updated: 2026-09-15
Quick answer
Hi, I'm Miya, and I help newcomers settle into life in Japan. This guide is about the bugs you're likely to meet in and around a Japanese home — cockroaches, mosquitoes, centipedes, and the hornets you might spot on a hike. If you've read about rainy-season mould or staying cool in summer, think of this as the companion piece for the creatures that arrive with the warm months.
The short version: most of it is handled with everyday habits — sealed food, regular rubbish days, intact window screens, and no standing water on the balcony. Common household products like bait traps, sprays, and mosquito repellents fill the gaps. And for anything you shouldn't tackle alone, such as a hornet nest or a problem in shared parts of the building, your management company or your city's pest consultation contact is the right place to ask.
Cockroaches: keep the kitchen uninviting
Cockroaches (gokiburi) are most active in the warm, humid months, and they can turn up even in clean, new buildings, so seeing one isn't a verdict on your housekeeping. What they're after is food, water, and somewhere dark to hide. Keeping food in sealed containers, not leaving dishes in the sink overnight, wiping crumbs and grease from around the stove, and drying the sink area before bed all make your kitchen far less interesting to them.
Rubbish matters too: tie bags closed and put them out on the right collection day rather than letting them pile up on the balcony. Flattened cardboard boxes from your move are a favourite hiding spot, so recycle them promptly. For products, the common types are bait traps you place in corners and under appliances, and sprays for the one you actually see. Whatever you use, follow the label, and keep traps and sprays away from children and pets.
Mosquitoes: screens, standing water and summer evenings
Mosquitoes (ka) are the classic summer nuisance, especially around dusk and near parks, rivers, and greenery. Many Japanese windows and balcony doors have sliding screens (amido), so the first habit is simply to close the screen whenever the window is open and check it for tears or gaps at the edges. If a screen in your rental is damaged, it's worth mentioning to your management company rather than living with it.
Mosquitoes breed in small pools of still water, so empty plant saucers, buckets, and anything on the balcony that collects rain. Indoors, people commonly use mosquito coils or plug-in repellents; outdoors, a skin repellent and long, light sleeves in the evening help. Use coils with some ventilation and away from anything flammable, and read the instructions on any repellent, especially for young children.
Centipedes and other seasonal visitors
Centipedes (mukade) can be a surprise, particularly in older homes, ground-floor flats, and places near trees or gardens, often in the rainy season and summer. They're not after you, but their bite can be genuinely painful. Don't pick one up or try to brush it off with bare hands; use a tool or container to move it outside, or a spray meant for crawling insects. Shaking out shoes, towels, and bedding that have sat near the floor is a simple habit in those months.
If you are bitten, wash the area and keep an eye on it. If the pain or swelling is strong, spreads, or you feel unwell, see a doctor or clinic rather than waiting it out. Beyond centipedes, you may meet spiders, ants, or small moths depending on your area and the season; most are harmless, and the same basics — sealing gaps, reducing clutter, and keeping things dry — go a long way.
Hornets on hikes and near home
Hornets (suzumebachi) are the ones to take seriously, and you're most likely to meet them outdoors — on hiking trails, in parks, or around shrines and wooded areas, especially from late summer into autumn. If one hovers near you, stay calm and move away slowly. Don't swat or wave your arms, as that can provoke it, and don't go near a nest if you spot one. It's often suggested to wear lighter-coloured clothing and skip strong scents when hiking.
If you're stung, move away from the area first, since others may follow. For any sting, getting checked at a clinic is sensible. If someone shows signs of a severe allergic reaction — trouble breathing, swelling of the face or throat, widespread hives, dizziness or faintness — call 119 for an ambulance straight away. This isn't medical advice, just the basics; a doctor is the one to guide you beyond that.
When to ask the management company or your city
Some things aren't meant for you to solve alone. If pests seem to be coming from shared areas, gaps around pipes or vents, or a neighbouring unit, or if a screen, door seal, or drain in your rental is damaged, contact your management company (kanri gaisha) or landlord. They know the building and can arrange repairs or pest control where it's their responsibility. A quick message with a photo is usually the easiest way to explain.
For a hornet nest on your balcony, under the eaves, or in the garden, don't try to remove it yourself. Tell your management company if you rent, and check with your city or ward: many municipalities offer pest consultation or can refer you to a specialist, though whether they handle removal and whether there's a charge differs by place. Your city's website or the ward office is the place to confirm how it works where you live.
One quiet thing to set up first
Most of this happens on your phone: finding your ward's pest-consultation contact, messaging your management company a photo of that torn screen, or looking up an unfamiliar bug on the spot before you decide what to do. So having a Japanese phone number with data in place early makes the whole thing smoother. Setting one up is refreshingly simple — you apply online with your residence card, verify with a quick eKYC, and eSIM-capable phones can connect the same day, often within about fifteen minutes.
Have a look at our setup guide for eligibility and the step-by-step, and confirm current terms on the page before you apply. Get the line sorted, settle into a few simple habits, and your new home will feel calm through every season. I'll be right here to help.
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