A hose clamp which can be produced at a low cost and quickly clamp a hose is provided. The hose clamp is made of resin and made by integrally forming a generally annular clamp body which is partially cut out and a lever continuing to an end of the cut out of the clamp body. The lever includes a first operating piece which is rotatably connected to one of the cut-out ends of the clamp body via a first hinge and has an engagement part on its tip and a second operating piece rotatably connected to the other of the cut-out ends of the clamp body via a second hinge. The tip of the second operating piece is connected to the first operating piece and an engaged part corresponding to the engagement part is formed on the outer periphery of the clamp body.