Wristwatch

1. A wristwatch comprising:

a case including a band attachment section having an attachment hole;

a band including a coupling hole in one end portion located coaxially with the attachment hole of the band attachment section;

a coupling member inserted into the coupling hole of the band and the attachment hole of the band attachment section and coupling the band with the band attachment section; and

a fixing member fixing the coupling member to the attachment hole of the band attachment section or the coupling hole of the band,

wherein the coupling member comprises a tubular member having a female screw on an inner peripheral surface and inserted into the coupling hole of the band and the attachment hole of the band attachment section, and a pair of screw members each having a male screw screwed into the female screw of the tubular member and a head section larger than an outer diameter of the tubular member.

2. The wristwatch according to claim 1 , wherein the end portion of the band comprises a pair of coupling end sections arranged on both sides of the band attachment section in a manner to straddle the band attachment section, and

wherein the coupling hole is provided in each of the pair of coupling end sections.

3. The wristwatch according to claim 1 , wherein the band attachment section comprises a pair of attachment sections arranged on both sides of the end portion of the band in a manner to straddle the end portion, and

wherein the attachment hole is provided in each of the pair of attachment sections.

4. The wristwatch according to claim 1 , wherein the end portion of the band comprises a pair of coupling end sections arranged on both sides of the band attachment section in a manner to straddle the band attachment section, and

wherein each coupling hole in the pair of coupling end sections comprises a small-diameter hole section into which the tubular member is inserted, and a large-diameter hole section into which the head section of the screw member is inserted.

5. The wristwatch according to claim 1 , wherein the coupling member comprises a first screw member having a male screw section, and a second screw member having a female screw section into which the male screw section of the first screw member is screwed.

6. The wristwatch according to claim 2 , wherein the coupling member comprises a first screw member having a male screw section, and a second screw member having a female screw section into which the male screw section of the first screw member is screwed.

7. The wristwatch according to claim 3 , wherein the coupling member comprises a first screw member having a male screw section, and a second screw member having a female screw section into which the male screw section of the first screw member is screwed.

8. The wristwatch according to claim 1 , wherein the fixing member is a fixing screw screwed into the attachment hole of the band attachment section or the coupling hole of the band along an axial direction so as to fix the coupling member.

9. The wristwatch according to claim 2 , wherein the fixing member is a fixing screw screwed into the attachment hole of the band attachment section or the coupling hole of the band along an axial direction so as to fix the coupling member.

10. The wristwatch according to claim 3 , wherein the fixing member is a fixing screw screwed into the attachment hole of the band attachment section or the coupling hole of the band along an axial direction so as to fix the coupling member.

11. The wristwatch according to claim 8 , wherein a buffer is arranged between the fixing screw and the coupling member.

12. The wristwatch according to claim 9 , wherein a buffer is arranged between the fixing screw and the coupling member.

13. The wristwatch according to claim 10 , wherein a buffer is arranged between the fixing screw and the coupling member.

14. A wristwatch comprising:

a case including a band attachment section having an attachment hole;

a band including a coupling hole in one end portion located coaxially with the attachment hole of the band attachment section;

a coupling member inserted into the coupling hole of the band and the attachment hole of the band attachment section and coupling the band with the band attachment section; and

a fixing member fixing the coupling member to the attachment hole of the band attachment section or the coupling hole of the band,

wherein the fixing member is a fixing screw screwed into the band attachment section or the end portion of the band in a direction orthogonal to an axial direction of the coupling member so as to fix the coupling member.

15. The wristwatch according to claim 14 , wherein an outer periphery of the coupling member has a position regulating groove into which the fixing screw is inserted.