A shoe that is conveniently put on and taken off includes an outsole, an upper, a supporting piece, and a guiding piece. The upper is attached on the outsole and has a counter and a collar extending upward from the counter and configured as a shoehorn. The supporting piece is attached to the counter and the collar of the upper. The guiding piece is attached to an instep of the upper. Because of the supporting piece having a predetermined hardness and the collar having a shape like a shoehorn, the rear of the upper can be served as a shoehorn for helping a user's foot in slipping into the shoe. In addition, the guiding piece can avoid the instep of the upper from becoming crease and unsmooth. As a result, the shoe is convenient for the user to put on without bending his back and using his hand.