The present invention relates to a locking device (1) for a sports footwear, said locking device being adapted to lock two mutually hinged portions (120, 130) of a sports footwear or to release them from each other. The present invention finds application in the field of ski boots, for locking the shell (120) and the cuff (130) of the ski boot relative to each other or to release them from each other. The locking device according to the invention comprises a male member (5) and a female member (7), which members comprise respective engaging means (5b, 7b) adapted to cooperate with each other, and actuating means (3; 3') for moving said members from a configuration in which the male member is disengaged from the female member to a configuration in which the male member is engaged with the female member. According to the invention, the engaging means (5b) of the male member (5) and/or the engaging means (7b) of the female member (7) have a tapered or conical shape, whereby it is possible to make a coupling without clearance between said male member and said female member when said members are engaged with each other.
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