Patent ID: 8920378

Claim:
An indwelling needle device comprising: a shield having an inner cavity; a soft outer needle fixed to a front end of the shield; a hub that is disposed within the inner cavity of the shield and is movable in a longitudinal direction of the shield; and an inner needle fixed to a front end of the hub, wherein the hub is displaced between an initial position at which the hub is located on a front end side of the inner cavity of the shield and the inner needle penetrates the outer needle and protrudes from a leading end of the outer needle to an outside and a retracted position at which the hub is located on a rear end side of the inner cavity of the shield and the inner needle is housed within the inner cavity of the shield, a first side hole penetrating an outer circumferential face of the outer needle is formed in the outer needle, a second side hole penetrating an outer circumferential face of the inner needle is formed in the inner needle, and when the hub is in the initial position, an inner circumferential face of a region of the outer needle that contains the first side hole is in close contact with the outer circumferential face of the inner needle, such that the first side hole of the outer needle is blocked, and the second side hole is located closer to the hub than the region where the inner circumferential face of the outer needle is in close contact with the outer circumferential face of the inner needle.