To reduce the number of part items, and simplify a structure by lifting a cover body upward when locking of the cover body is released, and removing the cover body when external force is applied to an opening cover.

In a cover body opening-closing device of a housing vessel for a vehicle which covers an opening 3 and in which a hinge 5 is installed on one side and to which a cover body 4 is rotatably connected and which has a locking part on the other side, a support shaft 7 is formed on one hinge piece 5a of the hinge 5, and is bent to the other hinge piece 5c, and a part is opened, and a freely mountable-demountable holding part 5e is formed on the support shaft 7, and is held so as to slip out by external force.