To provide a valve device preventing free flow despite a simple structure, as well as an infusion set and infusion device having the valve device.

The valve device 5 is interposed in an infusion tube 23 connectable to an infusion liquid holding container and an infusion pump. The valve device comprises a flexible tubular part 26 arranged in the mid of the infusion tube, a valve body 40 housed in the tubular part, and a holding part 60 holding the tubular part from outside. The slit 42 of the valve body is in a closed valve state when the tubular part is not held by the holding part and the slit opens and falls in an opened valve state because the valve body deforms by being pressed by the holding part when the valve is held by the holding part.

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