A terminal block connection structure for a rotary electric machine includes: a plurality of power lines configured such that respective first end portions are joined to stator coils of a plurality of phases of the rotary electric machine; terminal metal fittings provided in respective second end portions of the plurality of power lines; a terminal block to which the terminal metal fittings are fixed by respective fastening members; and a resin member integrated with an end part of at least one of the terminal metal fittings relative on an opposite side to the power lines across its corresponding fastening member. The terminal block is configured such that a plurality of power-source lines is connected to the terminal block and the terminal metal fittings are fixed to the terminal block by the respective fastening members so that the plurality of power lines is connected to the plurality of power-source lines, respectively.