A terminal connection structure which is downsized and easily connects terminal fixtures together without producing variation in electric resistance therebetween. The terminal connection structure connects a bus bar connected to an inverter and a second terminal fixture connected to a motor coil. The terminal connection structure includes a first housing receiving a thin-walled portion of the bus bar, a second housing receiving an electric-contact portion of the second terminal fixture and having an insert portion, a clip terminal arranged to make the thin-walled portion closely contact with the electric-contact portion, and a permitting/restricting portion, which permits the clip terminal to be attached to one of the first housing and the second housing when the insert portion is at a predetermined position and restricts the clip terminal from being attached to one of the first housing and the second housing when the insert portion is not at the predetermined position.