Abstract: A ratchet wrench including: a handle having a head section formed with a circular hole and a cavity; a ratchet wheel rotatably installed in the circular hole; two left and right symmetrical dogs side by side arranged in left and right sides of the cavity, an inner end of each dog being formed with a recess, the two recesses of the dogs being positioned opposite to each other to form a receiving space; two resilient members respectively disposed between the wall of the cavity and the two dogs, when not suffering external force, the resilient members resiliently forcing the dogs toward the ratchet wheel to engage therewith; a shifting member having symmetrical left and right ends which are respectively disposed in the two recesses of the two dogs; and a rotary switch connecting with the shifting member. When turning the rotary switch, the shifting member is angularly displaced to push one dog away from the ratchet wheel, while making the other dog resiliently engaged with the ratchet wheel.