Brake device and child carrier provided with the same

A brake device adapted to be disposed at a child carrier that includes a frame and at least one wheel unit, the wheel unit including a hub, a plurality of spokes radiating the hub, and an axle that rotatably extends through the hub, said brake device comprising:

• a base unit adapted to be connected to the frame, formed with a first guiding groove and a through hole, and adapted to allow the axle to extend therethrough and to rotatably connect the wheel unit to said base unit;
• an operable unit pivotally connected to said base unit and including at least one side wall formed with a first positioning hole and a second guiding groove, said operable unit being pivotable with respect to said base unit between a brake position and a release position;
• a brake unit disposed in said first and second guiding grooves, and slidable in said first and second guiding grooves in a first direction when said operable unit pivots with respect to said base unit between the brake position, where said brake unit is adapted to be disposed between adjacent two of the spokes, and the release position, where said brake unit is adapted to be separated from the spokes;
• and
• a positioning unit disposed in said through hole in said base unit, separated from said brake unit, and including a positioning component and an elastic member for providing a biasing force to said positioning component in a second direction different from the first direction, said first positioning hole being registered with said through hole in the second direction and said positioning component engaging said first positioning hole when said operable unit is at one of the brake position and the release position.