To provide a piping connection structure capable of connecting parts to piping without using a tool and of miniaturizing parts especially when parts are connected to two pipes arranged in parallel in an air conditioner for a vehicle.

Clamps 4, 5 are attached on outer circumferences of piping 2, 3 to get into contact with a flange part 33. When the piping 3 is inserted into an opening part 14 of an expansion valve body 11, both side edge parts 14 of the expansion valve body 11 get into contact with a taper part 53 of the clamp 5 and expands a gap between both side claw parts 55 of the clamp 5. When the piping 3 is inserted into the expansion body 11 until a periphery of the opening part 14 of the expansion valve body 11 gets into contact with the flange part 33, the claw parts 55 are fitted to grooves formed on both side surfaces of the expansion valve body 11, the clamp 5 clamps a part 19 in an opening part 14 side of the grooves 16 of the expansion valve body 11 and the flange part 33. Consequently, the piping 3 is fixed on the expansion valve body 11.

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