A position adjusting device for exercising apparatus includes a first frame body and a second frame body that are relatively displaceable in a longitudinal direction. A pressing member and a control assembly are respectively disposed at opposite sides of the first frame body. The control assembly has an axle portion and a deflection portion with an elastically extendable distance therebetween. At least one connecting arm connects the deflection portion and the pressing member. The control assembly is rotatable about the axle portion, so that the deflection portion is movable from a first position through a second position to a third position. When the deflection portion is in the first position, the distance is between a maximum length and a minimum length. When the deflection portion is in the second position, the distance is the minimum length. When the deflection portion is in the third position, the distance is the maximum length.