To provide a ventilator for ventilation container whose thickness is thinner.SOLUTION: By swinging a hook 52 around a shaft part 42 of a handle 41, a holder 51 of a ventilator 1 is configured so that a hook part 55 at the upper end of the hook 52 is hooked on a hook plate 64 of a receiver 53 to hold a waterproof packing 21 in an open position, therefore, the height of the holder 51 from an outer plate 15 of the main body 11 to the inside of the container can be kept low and the ventilator 1 can be made thinner.SELECTED DRAWING: Figure 2

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