A waste ink storage mechanism of the present disclosure includes a waste ink tank, a waste ink tank fitting portion and a capacitance sensor. The waste ink tank stores a waste ink exhausted from a recording head. The waste ink tank is fitted to the waste ink tank fitting portion such that the waste ink tank can be fitted into and removed from the waste ink tank fitting portion. The capacitance sensor is provided in the waste ink tank fitting portion so as to detect that a liquid surface within the waste ink tank reaches a predetermined level. The waste ink tank includes: a first surface in which an inflow port through which the waste ink flows in is formed; and a second surface, and the capacitance sensor is arranged close to the second surface.