How Big Is 'Oversized Trash' in Japan? Size Rules & How to Check

“Is this oversized trash, or can I put it out with regular garbage?” This is the most common question before disposal. Guess wrong and your item may be left uncollected. This page explains the size rules most Japanese municipalities use, and how to check the rule for your own city.

⚠️ Size thresholds differ by municipality. This page explains the general idea only. Always confirm the rule with your own city’s official information before disposal.

1. Most cities judge by “the longest side”

Most municipalities decide whether an item is oversized (粗大ごみ, sodai gomi) based on its longest side. Two thresholds are common:

So one city may say “under 30cm is regular trash,” while another allows “up to 50cm as regular trash.” This is why the same item can be treated differently depending on where you live.

How to measure

• Measure the longest dimension among height, width, and depth
• Protruding parts (handles, legs) are usually included
• Foldable items are usually judged in their in-use state, not folded

2. Some cities use criteria other than length

Not every municipality decides by length alone. Some also use:

• Whether it fits in a designated bag: if you can tie the bag shut, it’s regular trash
• Weight: over a set weight (e.g., 5kg or 10kg) becomes oversized
• Fixed by item type: bicycles, futons, microwaves, etc. are oversized regardless of size

So an item can be “small but oversized” or “large but regular trash.”

3. Items that often sit on the size borderline

These tend to fall right around 30–50cm and split by municipality:

• Electric fans, electric heaters
• Storage cubes, small shelves
• Rice cookers, microwaves (appliances may have separate rules)
• Suitcases
• Drying poles, curtain rails (long shapes easily become oversized)
• Floor chairs, small chairs

When in doubt, check your city’s page or call the oversized-waste reception center rather than guessing.

4. Why the rules differ by city

Sorting rules are set independently by each municipality to match its local collection and processing systems (a municipal duty under Japan’s Waste Management Act). Collection vehicles, facility capacity, bag sizes, and recycling policy all vary — so size thresholds are not standardized. “The next city does it this way” does not apply.

5. How to check the rule for your city

1. Open your city’s page on this site — we list each item’s sorting category, method, and fee
2. Search the official site for the size threshold (terms like “粗大ごみ 何センチ”)
3. Call the oversized-waste reception center if unsure — give the item name and dimensions

💡 Our item pages list the sorting category and fee as confirmed on your municipality’s official information. For the exact size threshold itself, we recommend checking the official source.

6. Typical steps for putting out oversized trash

Once an item is “oversized,” most municipalities use these steps:

1. Apply (reserve) by phone or web, giving item and quantity
2. Buy a fee sticker at a convenience store, etc.
3. Attach the sticker and put it out on the designated day/place (usually door-to-door)

Some cities also allow self-delivery to a facility, which can be cheaper.

Summary

• The oversized threshold is usually 30cm or 50cm on the longest side, but it differs by city
• Some cities judge by bag fit, weight, or fixed item type instead of length
• The same item can be treated differently between cities — “same as the next city” does not apply
• Always confirm with your own municipality’s official information

Related

• How to Spot Illegal Junk Removal Services
• Nationwide Oversized Trash Fee Comparison
• Editorial & Sourcing Policy