To provide a stroller which can be folded compact with a simple configuration.

A foldable outer frame includes two rear wheels 1, 2, and a front center rotation assist unit 3. A handlebar 4 is mounted on side face members 7, 8, and the side face members are connected to arm rests 10, 11 at upper ends through the pin joint connection. The arm rests are connected to branched portions 5, 6 of the handlebar through the pin joint connection. Bearing parts 13, 14 at lower ends of the side face members are mounted to rear wheels via a bent portion at a center portion of a shaft 15. Two connection rods 18, 19 are completely fixed to the center portion of the shaft, and free ends thereof are connected to a center auxiliary part, and formed as a connection part of an intermediate portion of a U-shaped member. A branched portion of the U-shaped member is connected to a lower end of the branched portion of the handle bar through the pin joint connection, and the intermediate portion of the U-shaped member is connected to the side face members through the pin joint connection.