Provided is a contact sensor device for fish, said contact sensor device being capable of adjusting the elastic force of an elastic member in accordance with variations in the magnitude of the tensile force on a mark during feeding which varies depending on the growth state of relatively large fish, and said elastic member preventing overloading of a pressure sensor and breakage of a fishing line. The present invention includes: a fishing line 22, an end part of which is attached to a mark 24 to be pulled by a fish； a pressure sensor 18 that senses pressure； a pressing piece 28 that is connected to the other end part of the fishing line 22, and transmits the tensile force acting upon the fishing line 22 to an operation part 26 of the pressure sensor 18； and an elastic member 32 that prevents overloading of the pressure sensor 18 by the pressing piece 28 and breakage of the fishing line 22. The elastic member 32 is provided with an elastic force adjustment means 38 that adjusts the elastic force of the elastic member 32 in accordance with the tensile force acting upon the pressing piece 28.
