To provide a connecting structure capable of improving workability and reliability.

A sheet material connecting clip is inserted into each penetrating hole in a condition in which the penetrating holes are corresponded and overlapped with each other, and is held between sheet materials provided with a penetrating hole from both surfaces of the sheet material, and the sheet materials are detachably connected to each other. And the sheet material connecting clip is provided with a first clip half body 12 which is projected from a stem part 14 and around upper and lower end outer periphery of the stem part 14, and which is provided integratedly with an upper slip-off preventive piece 16 for pinchedly holding the sheet materials and lower slip-off preventive half piece 15 shorter than the upper slip-off preventive piece 16; and a second clip half body 13 provided integratedly with a stem part rotatably assembled with the stem part 14 of the first clip half body 12, a lower slip-off preventive half piece 24 projected from a lower end side of the stem part in a diameter direction, and a tab part arranged on an upper end side of the stem part.