expansion and contraction direction with the up and down direction the twisted coil spring 38 is fixed by combining the case 14 and cover 17 up and down and bolting with a bolt not shown a coil roll 38 a of the twisted coil spring 38 presses the bottom plate 27 b downward thereby each contact member 2 can be mounted without a back lash the elastic force i e pressing force thereof is set so that the horizontal oscillation of each contact member 2 can be smoothly carried out a pair of legs 38 b of the twisted coil spring 38 biases the side plate 27 a of the part 27 for receiving the bias outward in the right and left direction thereby the contact 4 coming in contact with the electrode which continues from the side plate 27 a abuts against an electrode 36 buried in a partition wall 35 so as to be electrically connected to the electrode 36 the contact 4 which continues from the side plate 27 a is formed having a smoothly bulged shape thereby the contact between the contact 4 and the electrode 36 is always maintained even when each contact 3 oscillates as shown in fig3 and 4 one of the pair of contact members 2 that forms the female terminal 1 is connected to an electromagnetic coil rc 2 of an electromagnetic relay r 2 through the electrode 36 while the other of the pair of contact members 2 is grounded to the motor vehicle body through the electrode 36 consequently when.