Headphones

1. Headphones comprising:

a head band;

a first slider that is provided on one end side of the head band and slides with respect to the head band;

a second slider that is provided on the other end side of the head band and slides with respect to the head band;

a connecting portion that connects the first slider and the second slider and slides the second slider in linkage with a slide operation of the first slider; and

a pair of housings that are connected to the first slider and the second slider, respectively, and that each house a sound output unit, wherein

a folded portion is provided at the head band, and

the second slider is slid in the same direction as a slide direction of the first slider by the connecting portion being folded at the folded portion.

2. The headphones according to claim 1 ,

wherein the connecting portion slides the second slider substantially the same distance as a slide distance of the first slider by the slide operation of the first slider.

3. Headphones comprising:

a head band;

a first slider that is provided on one end side of the head band and slides with respect to the head band;

a second slider that is provided on the other end side of the head band and slides with respect to the head band;

a connecting portion that connects the first slider and the second slider and slides the second slider in linkage with a slide operation of the first slider; and

a pair of housings that are connected to the first slider and the second slider, respectively, and that each house a sound output unit,

wherein

a folded portion is provided at one side and the other side of the head band,

wherein the connecting portion includes a first connecting portion and a second connecting portion, and

wherein the first connecting portion slides the second slider in linkage with sliding of the first slider and the second connecting portion slides the first slider in linkage with sliding of the second slider.

4. The headphones according to claim 1 ,

wherein the connecting portion includes a wire rod.

5. Headphones comprising:

a head band;

a first slider that is provided on one end side of the head band and slides with respect to the head band;

a second slider that is provided on the other end side of the head band and slides with respect to the head band;

a connecting portion that connects the first slider and the second slider and slides the second slider in linkage with a slide operation of the first slider; and

a pair of housings that are connected to the first slider and the second slider, respectively, and that each house a sound output unit,

wherein the connecting portion is made of an aramid fiber, a metallic wire, or a carbon nanotube.

6. The headphones according to claim 1 ,

wherein the connecting portion is covered by an outer tube.

7. The headphones according to claim 1 ,

wherein the folded portion is configured by a pulley.

8. The headphones according to claim 1 ,

wherein the connecting portion is configured by a sound signal transmission line.

9. Headphones comprising:

a head band;

a first slider that is provided on one end side of the head band and slides with respect to the head band;

a second slider that is provided on the other end side of the head band and slides with respect to the head band;

a connecting portion that connects the first slider and the second slider and slides the second slider in linkage with a slide operation of the first slider; and

a pair of housings that are connected to the first slider and the second slider, respectively, and that each house a sound output unit,

wherein the connecting portion includes a sound signal transmission line, and

wherein the sound signal transmission line is electrically coupled to a signal line through which a sound signal from a sound reproducing device is transmitted.

10. The headphones according to claim 1 ,

wherein the connecting portion, and the first slider and the second slider are connected by a connector.

11. The headphones according to claim 1 ,

wherein the first slider and the second slider have positions that are maintained by friction with the head band.

12. The headphones according to claim 1 , wherein

the folded portion is provided only at one side of the head band, and

a notation is provided to indicate a side at which the folded portion of the head band is provided and a side at which the folded portion of the head band is not provided.

13. The headphones according to claim 3 ,

wherein the connecting portion slides the second slider substantially the same distance as a slide distance of the first slider by the slide operation of the first slider.

14. The headphones according to claim 3 ,

wherein the connecting portion includes a wire rod.

15. The headphones according to claim 3 ,

wherein the connecting portion is covered by an outer tube.

16. The headphones according to claim 3 ,

wherein the folded portion is configured by a pulley.

17. The headphones according to claim 3 ,

wherein the connecting portion is configured by a sound signal transmission line.

18. The headphones according to claim 3 ,

wherein the connecting portion, and the first slider and the second slider are connected by a connector.

19. The headphones according to claim 3 ,

wherein the first slider and the second slider have positions that are maintained by friction with the head band.

20. The headphones according to claim 5 ,

wherein the connecting portion slides the second slider substantially the same distance as a slide distance of the first slider by the slide operation of the first slider.