Operation terminal, the electronic unit and the electronic unit system

Discloses an operation terminal, an electronic unit and an electronic unit of the system. The operation terminal includes; posture detecting section detects the posture of the operation terminal, to change the posture, or both thereof; mode selecting part, based on the detection result of the posture detection section to from a plurality of operation modes include a gesture mode and a non-gesture mode selecting an operating mode; and a transmission section transmitting to a detection result of the posture detection section to the electronic control command unit when the gesture mode is currently selected.