A unidirectional drive tool mechanism includes a housing having three or more recesses formed in the inner peripheral surface. A shaft is rotatably engaged in the housing. Three or more pairs of rods are engaged in the recesses and three or more springs may bias the rods to engage with the ends of the recesses. A cap is engaged on the housing and has three or more poles extended inward of the housing for engaging with the rods. The pairs of rods each includes one rod forced to engage with one end portion of the recesses such that the shaft may be driven in one direction only, and each includes the other rod forced to engage with the other end portion of the recesses such that the shaft may be driven in the reverse direction only.
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