Connector

A connector connecting structure for connecting a connector mounted in an opening of a case of a first device and a mating connector mounted in a case of a second device and to be connected to the connector by overlapping and fixing the first device and the second device, wherein:

• the connector includes:
• a terminal holding portion configured to hold three terminals;
• a flange in the form of a flat plate, provided on an outer periphery of the terminal holding portion and to be sandwiched between the case of the first device and a case of the second device;
• a first sealing member mounted on a surface of the flange on the side of the first device and configured to seal between an outer surface of the case of the first device and the flange;
• and
• a second sealing member mounted on a surface of the flange on the side of the second device and configured to seal between an outer surface of the case of the second device and the flange;
• mounted positions of the first sealing member and the second sealing member are aligned in an overlapping direction of the first device and the second device;
• a smooth portion on the first device side slightly projecting toward the flange, having a smooth surface and to be held in close contact with the first sealing member is provided on the outer surface of the case of the first device;
• a smooth portion on the second device side slightly projecting toward the flange, having a smooth surface and to be held in close contact with the second sealing member is provided on the outer surface of the case of the second device;
• the flange includes a flange body in the form of a flat plate continuously provided to an outer surface of the terminal holding portion and thin portions provided on both sides in a terminal arrangement direction in the flange body;
• the first sealing member and the second sealing member are mounted on the flange body;
• and
• the thin portions are provided with collars made of metal, bolts for fixing the flange to the case of the first device being inserted through the collars.