A slide-type constant velocity universal joint for a drive shaft of an automobile, comprising: an outer ring in which six linear ball grooves are formed on a cylindrical inner circumferential surface in an axial direction, each of the ball grooves being shaped by a combination of two arcs each extending to a shoulder of the ball groove; an inner ring in which six linear ball grooves are formed on a spherical outer circumferential surface in the axial direction and a connecting hole for connecting a shaft is formed in a center section, each of the ball grooves being shaped by a combination of two arcs each extending to a shoulder of the ball groove; six torque transmission balls disposed on ball tracks formed by a pair composed of a ball groove on the outer ring and a ball groove on the inner ring; and a cage having pockets for storing the torque transmission balls, a convex spherical outer circumferential surface that is in contact with and guided by the inner circumferential surface of the outer ring, and a concave spherical inner circumferential surface that is in contact with and guided by the outer circumferential surface of the inner ring and in which a spherical surface center (O CO) of the outer circumferential surface and a spherical surface center (O CI) of the inner circumferential surface are offset to opposite sides of a pocket center in the axial direction, wherein the slide-type constant velocity universal joint has a maximum operating angle of 30° or more, characterized in that a ratio of ball diameter to outer ring outer diameter is 0.21 to 0.25, a ratio of ball pitch diameter to outer ring outer diameter is 0.64 to 0.68, a contact angle of the ball groove is 30° to 35°, a contact ratio of the ball groove is 1.02 to 1.08, and a ratio of cage offset amount to ball pitch diameter is 0.07 to 0.09. an outer ring in which six linear ball grooves are formed on a cylindrical inner circumferential surface in an axial direction, each of the ball grooves being shaped by a combination of two arcs each extending to a shoulder of the ball groove; an inner ring in which six linear ball grooves are formed on a spherical outer circumferential surface in the axial direction and a connecting hole for connecting a shaft is formed in a center section, each of the ball grooves being shaped by a combination of two arcs each extending to a shoulder of the ball groove; six torque transmission balls disposed on ball tracks formed by a pair composed of a ball groove on the outer ring and a ball groove on the inner ring; and a cage having pockets for storing the torque transmission balls, a convex spherical outer circumferential surface that is in contact with and guided by the inner circumferential surface of the outer ring, and a concave spherical inner circumferential surface that is in contact with and guided by the outer circumferential surface of the inner ring and in which a spherical surface center (O CO) of the outer circumferential surface and a spherical surface center (O CI) of the inner circumferential surface are offset to opposite sides of a pocket center in the axial direction, wherein the slide-type constant velocity universal joint has a maximum operating angle of 30° or more, characterized in that a ratio of ball diameter to outer ring outer diameter is 0.21 to 0.25, a ratio of ball pitch diameter to outer ring outer diameter is 0.64 to 0.68, a contact angle of the ball groove is 30° to 35°, a contact ratio of the ball groove is 1.02 to 1.08, and a ratio of cage offset amount to ball pitch diameter is 0.07 to 0.09.