Hose clamp

A hose clamp comprising:

• a claim body formed by bending a strip-shaped leaf spring material into an annular shape;
• and
• a pair of operation sections standing up in a radial direction from both end portions of the claim body,
• wherein tightening of a hose is made possible by diameter reduction by elastic restoring force of the claim body,
• the claim body is expanded in diameter by using elastic deformation by bringing the pair of operation sections close to each other,
• a locking section is formed on a side of the operation section on one side of the claim body,
• an engagement portion with which the locking section is engaged so as to be capable of being disengaged is formed on a side of the operation section on the other side of the claim body,
• the claim body is maintained in a diameter expansion state by engagement of the locking section with the engagement portion,
• when the claim body is reduced in diameter from the diameter expansion state, the engagement of the locking section with the engagement portion is released by bringing the operation section on one side close to the operation section on the other side and moving the operation section on one side with respect to the operation section on the other side in the opposing direction in an axial direction of the claim body, and
• a leak prevention section which approximately comes into contact with an area between both end portions of the claim body in the axial direction of the claim body and presses the hose during tightening of the hose is provided.