A connector comprising: a terminal receiving portion provided with terminal fittings (12a-12f) to be connected to electrodes (44a-44f) of a connector attachment portion; a cover member for covering the terminal receiving portion:a first interlock connector projecting from the cover member being provided with a first interlock terminal; a second interlock connector provided on the terminal receiving portion and configured to be fitted to the first interlock connector being provided with a second interlock terminal; and a switching device having energization detection circuit which is connected to a second interlock connector,wherein when the cover member covers the terminal receiving portion, the first and second interlock connectors (28,39) are fitted to each other whereby the second interlock terminal is configured to be short-circuited by the first interlock terminal provided on the first interlock connector, and whereby the terminal receiving portion is configured to permit conduction between the electrode of the connector attachment portion and the terminal fittings (12a-12f), wherein the terminal receiving portion is provided with a plurality of bolting chambers (11a, 11b) being adjacent to each other via the wall portion in which the terminal fittings (12a-12f) and the electrodes (44a-44f) are fastened with bolts (45a-45f) an insertion hole into which the first interlock connector is inserted, and a partition wall for separating the bolting chambers (11a, 11b) from the insertion hole, and wherein the second interlock connector is provided at a position corresponding to the insertion hole, characterized in that the thickness of the partition wall is formed about twice as a hole diameter of the insersion hole. a terminal receiving portion provided with terminal fittings (12a-12f) to be connected to electrodes (44a-44f) of a connector attachment portion; a cover member for covering the terminal receiving portion:a first interlock connector projecting from the cover member being provided with a first interlock terminal; a second interlock connector provided on the terminal receiving portion and configured to be fitted to the first interlock connector being provided with a second interlock terminal; and a switching device having energization detection circuit which is connected to a second interlock connector,wherein when the cover member covers the terminal receiving portion, the first and second interlock connectors (28,39) are fitted to each other whereby the second interlock terminal is configured to be short-circuited by the first interlock terminal provided on the first interlock connector, and whereby the terminal receiving portion is configured to permit conduction between the electrode of the connector attachment portion and the terminal fittings (12a-12f), wherein the terminal receiving portion is provided with a plurality of bolting chambers (11a, 11b) being adjacent to each other via the wall portion in which the terminal fittings (12a-12f) and the electrodes (44a-44f) are fastened with bolts (45a-45f) an insertion hole into which the first interlock connector is inserted, and a partition wall for separating the bolting chambers (11a, 11b) from the insertion hole, and wherein the second interlock connector is provided at a position corresponding to the insertion hole, characterized in that the thickness of the partition wall is formed about twice as a hole diameter of the insersion hole.