Control device

A control device comprising:

• a case made of a resin material and having an open side;
• a cover that covers the open side of the case to define a housing when the cover is fastened to the case;
• a circuit board housed in the housing;
• and
• a seal member that seals between the case and the cover;
• wherein
• screw holes that are open toward the cover are formed in the case;
• through holes are formed in the cover at positions facing the respective screw holes;
• the cover is fastened to the case by screwing cover bolts into the respective screw holes through the respective through holes;
• insertion holes are formed to extend through the case in an assembly direction of the cover with respect to the case;
• the housing is attached to an attachment target made of a metal material, by screwing attachment bolts into respective attachment holes in the attachment target through the respective insertion holes;
• and
• the attachment bolts are formed to press the cover against the case when the attachment bolts are inserted in the respective attachment holes,
• wherein projections are provided at peripheral edges of the respective insertion holes in the case, the projections facing heads of the respective attachment bolts in the assembly direction, and having a projecting height equal to or less than a thickness of the cover,
• further comprising cylindrical collars that are inserted into the respective insertion holes;
• wherein
• an end portion of each of the collars defines one of the projections.