A bicycle pedal device includes a pedal body, and upper and lower cleat retaining units mounted respectively on two opposite side surfaces of the pedal body. The pedal body includes a tubular portion adapted to be mounted rotatably on a bicycle pedal shaft, and a pair of front and rear U-shaped frame sections integrally formed with two sides of said tubular portion. Each of the U-shaped frame sections has two transverse bar sections which extend integrally and transversely from the tubular portion, and an axial bar section which interconnects the outer ends of the transverse bar sections so as to define a pair of front and rear spaces each of which is located between the tubular portion and one of the axial bar sections. The cyclist's shoe can be retained on the pedal body by either of the cleat retaining units.