To provide a return spring for a disk brake device capable of preventing scattering and falling of a return spring by a simple configuration.

A pair of the return springs 70, 70 is arranged facing brake pads 50, 60 for separating the brake pads 50, 60 arranged facing each other in the disk brake device from a rotor 80. It is characterized by that the return spring 70 has a folding part 72, and arm parts 74a, 74b extended in both ends of the folding part 72, engagement parts 76a, 76b with the brake pads 50, 60 are equipped in tip sides of the arm parts 74a, 74b, and the folding parts 72 in the pair of return springs 70 arranged facing each other are connected like a chain.