An indwelling needle device (100; 200; 300), comprising: a shield having a shield tube and an outer hub fixed to a front end of the shield tube, the shield having an inner cavity; a soft outer needle that is 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; a hard inner needle that is fixed to a front end of the hub; a tube that is connected to a rear end of the hub; and a stopper (170; 270; 370) that can be inserted into and pulled out of the inner cavity of the shield from a rear end of the shield; wherein the hub can be 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 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, the stopper includes an insertion portion that is inserted into the inner cavity of the shield and a base portion (180; 280; 380) that is located on a rear end of the insertion portion, when the insertion portion is inserted into the inner cavity of the shield and a leading end thereof is caused to abut against the hub located at the initial position, and the base portion is located outside the shield; characterised in that the base portion includes a roof portion (183; 283; 383) that exposes part of an outer circumferential face of the tube and covers the remainder thereof and a pair of grasping portions (185; 285; 385) that are arranged to sandwich the tube and can be elastically displaced so as to grip the tube. a shield having a shield tube and an outer hub fixed to a front end of the shield tube, the shield having an inner cavity; a soft outer needle that is 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; a hard inner needle that is fixed to a front end of the hub; a tube that is connected to a rear end of the hub; and a stopper (170; 270; 370) that can be inserted into and pulled out of the inner cavity of the shield from a rear end of the shield; wherein the hub can be 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 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, the stopper includes an insertion portion that is inserted into the inner cavity of the shield and a base portion (180; 280; 380) that is located on a rear end of the insertion portion, when the insertion portion is inserted into the inner cavity of the shield and a leading end thereof is caused to abut against the hub located at the initial position, and the base portion is located outside the shield; characterised in that the base portion includes a roof portion (183; 283; 383) that exposes part of an outer circumferential face of the tube and covers the remainder thereof and a pair of grasping portions (185; 285; 385) that are arranged to sandwich the tube and can be elastically displaced so as to grip the tube.