Patent ID: 8266967

Claim:
A state detecting device provided in a tube to detect a state of a liquid flowing in the tube, said state detecting device comprising: a liquid hold part in which the liquid is stored; an inflow part from which the liquid enters said liquid hold part; an outflow part from which the liquid exits from said liquid hold part; and an inlet that is a rear end portion of said inflow part; and an outlet that is a front end portion of said outflow part, said inlet and said outlet being positioned higher than a center of said liquid hold part in a vertical direction when said state detecting device is provided in the tube, wherein said inflow part and said outflow part are arranged so that an inflow direction axis and an outflow direction axis do not cross each other, the inflow direction axis representing a flowing direction of the liquid entering from said inlet through a center of said inlet, and the outflow direction axis representing a flowing direction of the liquid exiting from said outlet through a center of said outlet.