This biosignal detection device (1) is provided with: a first ECG electrode (11) having a first leaf spring unit (11c) and a second leaf spring unit (11d) which are elastic and which, worn on a users finger, hold the finger by pressing from the sides (the sides of the finger) with respect to the bending direction of the finger and a photoelectric pulse wave sensor (21) which has a light emitting element (211) and a light receiving element (212) arranged on the second leaf spring unit (11d). The first leaf spring unit (11c) and the second leaf spring unit (11d) are conductive. Further, the first leaf spring unit (11c) has a cross section formed in an arcuate shape.
