Connection device

A connection device comprising:

• an engaging claw extending in a first direction from a first member, and a receiving portion provided in a second member, to fit with the engaging claw;
• the engaging claw comprising a pair of first side surfaces each extending in the first direction and opposing each other with an interval therebetween, and a pair of engaging protrusions provided in an extending end portion of the engaging claw and each projecting out from the respective first side surface in a direction intersecting the first direction, the engaging protrusions each comprising an inclined surface continuous from the first side surfaces and extending to be inclined to the first direction, and
• the receiving portion comprising an insertion opening to which the engaging claw is inserted, a pair of slopes extending in the first direction and each including a second side surface engaging the first side surface, and an engaging projection connected to the second side surface, the engaging projection engaging the engaging protrusion.