Ski boot comprising a shell (1; 21; 41; 61) surrounding the foot and an upper cuff (2; 22; 42; 62) articulated to the shell, comprising a device for fastening and unfastening the upper cuff relative to the shell, this device being connected to a fastening and unfastening member by a cable (10; 30; 50; 70), this fastening and unfastening device being in a first, fastened, configuration when the fastening and unfastening member is in a first position in which the upper cuff is kept in a predefined inclined position relative to the shell, and in a second, unfastened, configuration when the fastening and unfastening member is in a second position in which the upper cuff is able to move relative to the shell so that it can be stood up straight, wherein the connection between the cable (10; 30; 50; 70) and the boot fastening and unfastening member is such that moving the fastening and unfastening member from the first to the second position introduces tension into the cable, this cable being directly connected to a control element (8; 28; 48; 68) able to change the configuration of the upper cuff fastening and unfastening device by action on a cam surface (9; 29; 49; 69).