A medical needle with a protector comprising: a hub at a front end supporting a rear end of a needle tube; a cylindrical protector that is capable of storing a needle tube by sliding the hub; a first lock unit (42a, 42b, 73) that locks the hub to the protector in a manner capable of unlocking in a first state that the needle tube protrudes from the protector; and a second lock unit (43, 75) that locks the hub to the protector in a manner incapable of at least a transition to the first state in a second state that the needle tube is stored in the protector, characterized in that a front end side part of the hub includes a step-shaped protrusion portion (75, 75a) that forms an end surface facing to the front end side by separating at least a part of outer peripheral surface in a direction away from an axial line of the hub, the protector includes: a large cylindrical portion extending in a needle axis direction; a protrusion piece that is provided on a rear end side of the large cylindrical portion, extends to a rear end side of the protector, and is elastically deformable in a direction away from an axial line of the protector; a width-increased portion that is provided on an outer peripheral side of the protrusion piece on the rear end side of the large cylindrical portion, has a larger diameter than the large cylindrical portion, and has a minor axis and a major axis when viewed along the needle axis direction, the second lock unit (43, 75) is configured such that a rear end side of the protrusion piece contacts with the end surface of the step-shaped protrusion portion in the second state, and the protrusion piece is formed integrally with the large cylindrical portion on the major axis side of the width-increased portion. a hub at a front end supporting a rear end of a needle tube; a cylindrical protector that is capable of storing a needle tube by sliding the hub; a first lock unit (42a, 42b, 73) that locks the hub to the protector in a manner capable of unlocking in a first state that the needle tube protrudes from the protector; and a second lock unit (43, 75) that locks the hub to the protector in a manner incapable of at least a transition to the first state in a second state that the needle tube is stored in the protector, characterized in that a front end side part of the hub includes a step-shaped protrusion portion (75, 75a) that forms an end surface facing to the front end side by separating at least a part of outer peripheral surface in a direction away from an axial line of the hub, the protector includes: a large cylindrical portion extending in a needle axis direction; a protrusion piece that is provided on a rear end side of the large cylindrical portion, extends to a rear end side of the protector, and is elastically deformable in a direction away from an axial line of the protector; a width-increased portion that is provided on an outer peripheral side of the protrusion piece on the rear end side of the large cylindrical portion, has a larger diameter than the large cylindrical portion, and has a minor axis and a major axis when viewed along the needle axis direction, the second lock unit (43, 75) is configured such that a rear end side of the protrusion piece contacts with the end surface of the step-shaped protrusion portion in the second state, and the protrusion piece is formed integrally with the large cylindrical portion on the major axis side of the width-increased portion. a large cylindrical portion extending in a needle axis direction; a protrusion piece that is provided on a rear end side of the large cylindrical portion, extends to a rear end side of the protector, and is elastically deformable in a direction away from an axial line of the protector; a width-increased portion that is provided on an outer peripheral side of the protrusion piece on the rear end side of the large cylindrical portion, has a larger diameter than the large cylindrical portion, and has a minor axis and a major axis when viewed along the needle axis direction, the second lock unit (43, 75) is configured such that a rear end side of the protrusion piece contacts with the end surface of the step-shaped protrusion portion in the second state, and the protrusion piece is formed integrally with the large cylindrical portion on the major axis side of the width-increased portion.