Abstract: A device for an injection molding machine for releasably fastening a tool member to a fixing plate. The device includes a profiled part provided either on the fixing plate or on the tool member and a fixing element attached to the other component and provided with engaging members adapted to be moved relative to the profiled part and be brought into engagement with it to fasten the tool member and fixing plate together. The engaging members are one or more elongated carrier members that are brought into engagement with a profile on the profiled part, and a locking component is provided, displaceable in the longitudinal direction of the carrier members to move the carrier members into engagement with the profiled part.