A manual binding tool including a mechanism for applying plastic deformation to a tie portion located in a head portion to forcibly cause tie portions to engage with each other. A manual binding tool has a tie holding portion that receives and supports a head portion, a tightening mechanism that pulls a projection tie portion that projects through the head portion, a return preventing mechanism that blocks a return movement of the projection tie portion with respect to the head portion that is supported by the tie holding portion, and a pushing mechanism that, in a state where the head portion is supported by the tie holding portion, pushes and deforms a passed tie portion located in the head portion, and that causes the deformed portion to be engaged into an engagement hole of a root tie portion on which the head portion is previously surroundingly held.