A cap unit and a drink container which can prevent leaking of a drink through an air passage hole when the drink moves quickly in the upside down direction, being attached to a main container body 2, comprising a main cap body 10 and has a top wall section 10a and a circumferential wall section 10b, a lid body 20 disposed on top of the main cap body 10, a hinge 30 which rotatably couples the lid body 20, and a watertight packing 40 which seals the space between the main container body 2 and the main cap body 10, wherein the main cap body 10 has a liquid passage hole 12 and an air passage hole 13 covered by the lid body 20, and the air passage hole 13 is covered by the watertight packing 40 when seen from below.
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