Abstract: A bin cap for mushroom culture bins for cultivating mushrooms such as shiitake (Lentinus edodes (Berk.) Sing.), Lyophyllum shimeji (Kawam.) Hongo, and the like which includes a housing part 2 including a space S internally for ventilation and having windows 2w for ventilation with a broader open area than the open area of bin mouth Bo, breathable filter part 3 blocking window 2w, and fitting part 4 being installed at the under surface 2d of housing part 2 and being attached to or detached from bin mouth Bo. Thereby, the ventilation is secured and the exhaust of carbon dioxide is promoted.

Abstract: A bin for mushroom culture for cultivating mushrooms such as shiitake that comprises upper half bin 2 and lower half bin 3 so arranged as to be able to elongate and contract by sliding upward and downward when fitted. Fitting part C of upper half bin 2 and lower half bin 3 is so arranged as to form a ventilating route F connecting the inside and outside at an elongated position P2 compared with the most contracted position P1. Thereby, ventilation is performed through ventilating route F and carbon dioxide, which is heavier than air, is exhausted.