A sliding ball type constant velocity joint for a vehicle, comprising: an outer race rotating by receiving rotational power from an end of a shaft and having a track groove pair formed by a pair of track grooves (A1a) and (A1 b) on its inner surface, the outer race including a spherical inner surface formed between adjacent track groove pairs that is larger than a spherical inner surface formed between the pair of track grooves (A1a) (A1 b); an inner race installed in the outer race having a track groove pair formed by a pair of track grooves (B1 a) (B1 b)on its outer surface to correspond to the track groove pair of the outer race A; a spherical outer surface formed between adjacent track grooves is larger than a spherical outer surface formed between the pair of the track grooves (B1a) and (B1b). a plurality of balls installed in the track groove pairs formed in the outer race and the pair of track grooves formed in the inner race, for transmitting the rotational power of the outer race to the inner race; and a cage having windows, each window being sized and configured for accommodating and supporting two of the balls. wherein the outer race and the inner race include a plurality of pairs of track grooves, respectively. wherein a punching angle (γ) is defined in the windows of the cage and is defined in a range of 10 to 40 degrees, wherein the number of windows of the cage is half the number of balls. of characterised in that the inner race, the spherical outer surface formed between adjacent track groove pairs comes into contact with a spherical inner surface of the cage, while a spherical outer surface formed between a pair of track grooves (B1 a) and (B1 b) does not come into contact with a spherical inner surface of the cage. an outer race rotating by receiving rotational power from an end of a shaft and having a track groove pair formed by a pair of track grooves (A1a) and (A1 b) on its inner surface, the outer race including a spherical inner surface formed between adjacent track groove pairs that is larger than a spherical inner surface formed between the pair of track grooves (A1a) (A1 b); an inner race installed in the outer race having a track groove pair formed by a pair of track grooves (B1 a) (B1 b)on its outer surface to correspond to the track groove pair of the outer race A; a spherical outer surface formed between adjacent track grooves is larger than a spherical outer surface formed between the pair of the track grooves (B1a) and (B1b). a plurality of balls installed in the track groove pairs formed in the outer race and the pair of track grooves formed in the inner race, for transmitting the rotational power of the outer race to the inner race; and a cage having windows, each window being sized and configured for accommodating and supporting two of the balls. wherein the outer race and the inner race include a plurality of pairs of track grooves, respectively. wherein a punching angle (γ) is defined in the windows of the cage and is defined in a range of 10 to 40 degrees, wherein the number of windows of the cage is half the number of balls. of characterised in that the inner race, the spherical outer surface formed between adjacent track groove pairs comes into contact with a spherical inner surface of the cage, while a spherical outer surface formed between a pair of track grooves (B1 a) and (B1 b) does not come into contact with a spherical inner surface of the cage.