A cup holder comprises a lid body in which an upper lid and a lower lid are connected by an engagement mechanism. The engagement mechanism includes: a claw part that protrudes from the upper lid; an arch part that protrudes from the lower lid and engages with the claw part; and a protrusion wall that is provided contiguously to the upper lid or the lower lid and restricts the arch part from collapsing in a state where the claw part and the arch part are engaged.