An injection-needle cover comprising; a base portion which is fixed to an injection needle protruding face of a syringe, having a cylinder and an injection needle protruding from the cylinder, so as to enclose the injection needle, the injection needle protruding face being a face of the syringe from which the injection needle is protruding from the cylinder; a base hinge which is a hinge provided to the base portion; a connected portion fitting space forming portion which is connected to the base portion by the base hinge so as to turn about a base axis orthogonal to a central axis of the injection needle and which forms a space where a portion of the injection needle connected to the cylinder is to become fitted; a connecting hinge which is a hinge provided to the connected portion fitting space forming portion; and an injection needle enclosure portion which is connected to the connected portion fitting space forming portion by the connecting hinge so as to turn about a connection axis parallel to the base axis, the injection needle enclosure portion including paired base-side wall portions forming a base-side axial space where a portion of the injection needle is to become fitted, a cylinder portion which is continuous from the paired base-side wall portions and which forms an intra-cylinder space communicating with the base-side axial space, paired tip-end-side wall portions which are continuous from the cylinder portion, which form a tip-end-side axial space where a tip end portion of the injection needle is to become fitted, so that the tip-end-side axial space communicates with the intra-cylinder space, and which are disposed on the opposite side of the cylinder portion from the paired base-side wall portions so that the base-side axial space and the tip-end-side axial space are aligned with each other, and an injection needle contact portion disposed at such a position in one of the base-side axial space and the intra-cylinder space as to come in contact with the injection needle when the base hinge opens, wherein the injection needle contact portion has a force receiving portion which receives a force from the injection needle when the force receiving portion comes in contact with the injection needle and a connecting portion which connects the paired base-side wall portions or the cylinder portion to the force receiving portion and the force receiving portion has an easy sliding portion which is disposed in an area adjacent to an injection needle and which slides along the injection needle more easily than a case where an edge having an equal coefficient of static friction to a surface of the connecting portion and crossing the injection needle slides along the injection needle, the area being closer to an area on a side of the tip-end-side axial space than a portion, which faces the injection needle after the injection needle becomes fitted in the base-side axial space and the tip-end-side axial space, wherein the easy sliding portion has an injection needle contact zone extending along a direction of movement of the easy sliding portion in opening of the connecting hinge, the injection needle contact zone is provided with a curved face extending from one end to the other end of the injection needle contact zone in the direction of the movement of the easy sliding portion in the opening of the connecting hinge, wherein the connecting portion has a bottom plate portion which is disposed in the base-side axial space to be adjacent to a boundary between the base-side axial space and the intra-cylinder space and opposite ends of which are connected to the base-side wall portions and a structural body portion protruding from an end portion of the bottom plate portion facing the intra-cylinder space toward the base-side axial space and a curved face is provided to a portion of the bottom plate portion extending from the opposite face from a face facing the base-side axial space to the end portion, and wherein a plate-shaped portion faces one of the paired base-side wall portions with a clearance left therebetween and the force receiving portion faces the one of the paired base-side wall portions, which the plate-shaped portion faces with the clearance left therebetween, with a clearance left therebetween.