Transportation device

A transportation device comprising:

• a frame comprising a rail, a fixing base, an unlock member and a sliding member, the fixing base being slidably connected to the rail, the rail having at least one first engaging hole, the at least one first engaging hole having a first retaining wall, the unlock member being movably disposed in the fixing base, the unlock member having an engaging portion, the engaging portion protruding from the fixing base, the sliding member being slidably disposed in the fixing base, an end of the sliding member abutting against the unlock member;
• and
• a carrier comprising a connecting base, the connecting base having a rib, the connecting base being connected to the fixing base to install the carrier on the frame;
• wherein, when the carrier faces a first direction, the rib pushes the sliding member to push the unlock member, such that a length of the engaging portion protruding from the fixing base is reduced, and the engaging portion is unable to be retained by the first retaining wall;
• wherein, when the carrier faces a second direction different from the first direction, the rib is staggered with the sliding member, such that the engaging portion is able to be retained by the first retaining wall.