The new design of inchworm-type piezoelectric actuator is presented in this paper, Compared to conventional inchworm-type actuators, which are composed of more than three piezoelectric bodies, we can reduce the number of piezoelectric bodies by employing the proposed design, resulting in only one piezoelectric body. The overall size of the proposed actuator which consists of one piezoelectric body, two clamping parts and one extending part, is only $5{ imes}6{ imes}9 [mm^3]$ (DWL). The actuating characteristics of fabricated Monolithic Inchworm Type Actuator(MITA), were found to be a displacement of $0.3{mu}m$, a generating force of 0.6N and an electric power of 0.5W.