[Problem to be Solved] To provide a terminal connection structure which is downsized and which can easily connect terminal fixtures together without producing the variation in electric resistance between the terminal fixtures.[Solution] A terminal connection structure connects a bus bar connected to an inverter and a second terminal fixture connected to a coil of a motor. 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 to closely contacted with the electric-contact portion, and a permitting/restricting portion. The permitting/restricting portion permits the clip terminal to be attached to one of the first housing and the second housing when the insert portion is positioned 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 positioned at the predetermined position.