PROBLEM TO BE SOLVED: To correctly input biological signals acquired from specific locations of a living body to input terminals of an electronic device.SOLUTION: A biological signal monitor system 100c comprises: biological electrodes 11-13 fixed to a surface of a garment 200 in contact with a living body 201 connector receptacles 1-3 and 52 attached to a surface on the side opposite to the surface of the garment 200 in contact with the living body 201 a radio electronic device 30c that processes biological signals detected by the biological electrodes 11-13 and connector plugs 7-9 and 53 attached to a case surface of the radio electronic device 30c so as to be fitted to the connector receptacles 1-3 and 52. Connectors of different sizes including the connector receptacles 1-3 and the connector receptacle 52 are arranged on the surface of the garment 200, and connectors of different sizes including the connector plugs 7-9 and the connector plug 53 are arranged on the case surface of the radio electronic device 30c.SELECTED DRAWING: Figure 4