To provide a cap unit that prevents damage to the handle or hinge part when an impact or the like is applied to a handle or hinge part, a cap unit 1A is detachably attached to a container body 2 with an opening in the upper part thereof, provided with a cap body 7 for closing an upper opening of the container body 2 and a handle member 9 having both ends rotatably attached via a pair of hinge parts 8 to the cap body 7, wherein the handle member 9 has an arch part 9a that curves between both ends and has a shape that decreases in thickness toward a middle part of the arch part 9a, and is rotated between a first position positioned above the cap body 7 and a second position positioned on the side of the cap body 7.