the case where the coaxial cables 11 and 12 have a characteristic impedance of 75 u03c9 terminating resistors 13 and 14 having an impedance of 75 u03c9 are employed fig3 a to 3e are views of one embodiment of the present invention in particular fig3 a is a plan view of the same fig3 b is a front view of the same fig3 c is a side view of the same fig3 d is a front view partially in section of the same and fig3 e is a sectional side view taken along the line iiie iiie in fig3 d first referring to fig3 a to 3e the structure of the slide switch 1 included in one embodiment of the present invention will be described the slide switch 1 mainly comprises a resin case 4 an inner case 5 constituting a shield member a shield plate 6 an outer case 8 a bent member 9 and a slider 7 fig4 a to 4d are views showing the resin case having the shield case fixed thereto in particular fig4 a is a plan view of the same fig4 b is a front view partially in section of the same fig4 c is a side view of the same and fig4 d is a bottom view of the same now referring to fig4.