An operation device comprising: an electrode terminal portion (26, 36, 260, 360, 460) which is arranged just below an operation region (124a, 124b) on a top plate made of a material having an electric insulating property, and serves as an electrostatic capacity type touch switch (124a, 124b); a guide holder (27, 37) which slidably holds the electrode terminal portion; and an operation substrate which is provided with the guide holder (27, 37), wherein the electrode terminal portion (26, 36, 260, 360, 460) has a detection portion (26a, 36a, 260a, 360a, 460a) which comes into close contact with a back surface of the operation region (124a, 124b), a spring portion (26b, 36b, 260b, 360b, 460b) which has an elastic force pressing the detection portion to the back surface of the operation region (124a, 124b), and a slide portion (26c, 36c, 260c, 360c, 460c) which is movably retained in the guide holder (27, 37), moves together with the detection portion (26a, 36a, 260a, 360a, 460a) due to the elastic force of the spring portion, and presses the detection portion (26a, 36a, 260a, 360a, 460a) to the back surface of the operation region, and wherein the detection portion (26a, 36a, 260a, 360a, 460a), the spring portion (26b, 36b, 260b, 360b, 460b) and the slide portion (26c, 36c, 260c, 360c, 460c) are integrally formed of a metal material, and a change of an electrostatic capacity in the electrode terminal portion is configured to be output as an operation signal, wherein the detection portion (26a, 36a, 260a, 360a, 460a) of the electrode terminal portion (26, 36, 260, 360, 460) has a flat surface which is in parallel to the back surface of the operation region (124a, 124b) on the top plate, and forms a top surface of the electrode terminal portion (26, 36, 260, 360, 460), and wherein the spring portion (26b, 36b, 260b, 360b, 460b) and the slide portion (26c, 36c, 260c, 360c, 460c) are formed in each of both side surfaces of the electrode terminal portion (26, 36, 260, 360, 460) so as to support both sides of the detection portion (26a, 36a, 260a, 360a, 460a), and the slide portion (26c, 36c, 260c, 360c, 460c) is movably retained in the guide holder (27, 37) at a time when the slide portion (26c, 36c, 260c, 360c, 460c) and the detection portion (26a, 36a, 260a, 360a, 460a) move due to the elastic force of the spring portion (26b, 36b, 260b, 360b, 460b), and the detection portion (26a, 36a, 260a, 360a, 460a) comes into contact with the back surface of the top plate. an electrode terminal portion (26, 36, 260, 360, 460) which is arranged just below an operation region (124a, 124b) on a top plate made of a material having an electric insulating property, and serves as an electrostatic capacity type touch switch (124a, 124b); a guide holder (27, 37) which slidably holds the electrode terminal portion; and an operation substrate which is provided with the guide holder (27, 37), wherein the electrode terminal portion (26, 36, 260, 360, 460) has a detection portion (26a, 36a, 260a, 360a, 460a) which comes into close contact with a back surface of the operation region (124a, 124b), a spring portion (26b, 36b, 260b, 360b, 460b) which has an elastic force pressing the detection portion to the back surface of the operation region (124a, 124b), and a slide portion (26c, 36c, 260c, 360c, 460c) which is movably retained in the guide holder (27, 37), moves together with the detection portion (26a, 36a, 260a, 360a, 460a) due to the elastic force of the spring portion, and presses the detection portion (26a, 36a, 260a, 360a, 460a) to the back surface of the operation region, and wherein the detection portion (26a, 36a, 260a, 360a, 460a), the spring portion (26b, 36b, 260b, 360b, 460b) and the slide portion (26c, 36c, 260c, 360c, 460c) are integrally formed of a metal material, and a change of an electrostatic capacity in the electrode terminal portion is configured to be output as an operation signal, wherein the detection portion (26a, 36a, 260a, 360a, 460a) of the electrode terminal portion (26, 36, 260, 360, 460) has a flat surface which is in parallel to the back surface of the operation region (124a, 124b) on the top plate, and forms a top surface of the electrode terminal portion (26, 36, 260, 360, 460), and wherein the spring portion (26b, 36b, 260b, 360b, 460b) and the slide portion (26c, 36c, 260c, 360c, 460c) are formed in each of both side surfaces of the electrode terminal portion (26, 36, 260, 360, 460) so as to support both sides of the detection portion (26a, 36a, 260a, 360a, 460a), and the slide portion (26c, 36c, 260c, 360c, 460c) is movably retained in the guide holder (27, 37) at a time when the slide portion (26c, 36c, 260c, 360c, 460c) and the detection portion (26a, 36a, 260a, 360a, 460a) move due to the elastic force of the spring portion (26b, 36b, 260b, 360b, 460b), and the detection portion (26a, 36a, 260a, 360a, 460a) comes into contact with the back surface of the top plate.