A semimanufactured product of a movement regulation member to be installed onto a stabilizer bar for a vehicle, wherein the semimanufactured product includes: a plate-shaped bridging portion; a first curved portion which extends from one end portion of the bridging portion integrally; and a second curved portion which extends from the other end portion of the bridging portion integrally, and an entirety of the semimanufactured product is formed in a C-shape; the first curved portion includes a first locking part at an end portion of the first curved portion; the second curved portion includes a second locking part that engages with the first locking part at an end portion of the second curved portion; the first locking part includes a convex-shaped convex portion and a pair of receiving portions (45a, 45b) positioned so as to sandwich the convex portion; the second locking part includes a concave-shaped concave portion which can accommodate the convex portion and a pair of projecting portions (55a, 55b) positioned so as to sandwich the concave portion; each of the pair of projecting portions includes a protruding portion (57a, 57b) which protrudes from a tip portion of the projecting portion toward an opening of the concave portion; the convex portion includes a constricted portion in a base end portion of the convex portion; the pair of receiving portions include: a shoulder portion (46a, 46b) which is positioned at an outer side of the first locking part in a width direction and projects in an expanding direction of the convex portion; and a guide surface (48a, 48b) which is inclined to a direction opposite to the expanding direction of the convex portion toward the constricted portion with respect to the shoulder portion; height of the pair of protruding portions is larger as compared with depth of the concave shape of the guide surface; a gap between the first and second locking parts is larger as compared with twice a radius of curvature D 2 of the first curved portion, and the semimanufactured product of the movement regulation member is configured to be installed onto a stabilizer bar as a completed product by the convex portion being accomodated in the concave portion upon administering clamping work that makes the first and second locking parts engage with each other; and by the pair of protruding portions being able to plastically deform so as to fill concave spaces sectioned by the guide surface including the constricted portions toward an inner side in a width direction of the first locking part when pressed onto the guide surfaces which are continuous to the shoulder portions after contacting the guide surface of the pair of receiving portions. the semimanufactured product includes: a plate-shaped bridging portion; a first curved portion which extends from one end portion of the bridging portion integrally; and a second curved portion which extends from the other end portion of the bridging portion integrally, and an entirety of the semimanufactured product is formed in a C-shape; the first curved portion includes a first locking part at an end portion of the first curved portion; the second curved portion includes a second locking part that engages with the first locking part at an end portion of the second curved portion; the first locking part includes a convex-shaped convex portion and a pair of receiving portions (45a, 45b) positioned so as to sandwich the convex portion; the second locking part includes a concave-shaped concave portion which can accommodate the convex portion and a pair of projecting portions (55a, 55b) positioned so as to sandwich the concave portion; each of the pair of projecting portions includes a protruding portion (57a, 57b) which protrudes from a tip portion of the projecting portion toward an opening of the concave portion; the convex portion includes a constricted portion in a base end portion of the convex portion; the pair of receiving portions include: a shoulder portion (46a, 46b) which is positioned at an outer side of the first locking part in a width direction and projects in an expanding direction of the convex portion; and a guide surface (48a, 48b) which is inclined to a direction opposite to the expanding direction of the convex portion toward the constricted portion with respect to the shoulder portion; height of the pair of protruding portions is larger as compared with depth of the concave shape of the guide surface; a gap between the first and second locking parts is larger as compared with twice a radius of curvature D 2 of the first curved portion, and the semimanufactured product of the movement regulation member is configured to be installed onto a stabilizer bar as a completed product by the convex portion being accomodated in the concave portion upon administering clamping work that makes the first and second locking parts engage with each other; and by the pair of protruding portions being able to plastically deform so as to fill concave spaces sectioned by the guide surface including the constricted portions toward an inner side in a width direction of the first locking part when pressed onto the guide surfaces which are continuous to the shoulder portions after contacting the guide surface of the pair of receiving portions.