Fixing device and image forming apparatus

1. A fixing device comprising:

a rotatable endless fixing belt;

a pressing member configured to form a pressing area with the fixing belt;

a pushing member configured to come into contact with an inner circumferential face of the fixing belt via a lubricant and to push the fixing belt to the pressing member at the pressing area; and

a cap configured to be attached to an end portion of the fixing belt through an elastic member and to be rotated together with the fixing belt,

wherein the cap has a contact part with which an end face of the fixing belt comes into contact,

the contact part has a groove configured to store the lubricant leaked from the inner circumferential face of the fixing belt, and

the groove is formed such that a width is varied along a radial direction of the cap.

2. The fixing device according to claim 1 ,

wherein the width is increased toward an inner side along the radial direction.

3. The fixing device according to claim 1 ,

wherein the width is decreased toward an inner side along the radial direction.

4. The fixing device according to claim 1 ,

wherein the groove is shaped in a pyramid.

5. The fixing device according to claim 1 ,

wherein the groove has an inner corner surrounded by three walls.

6. The fixing device according to claim 1 ,

wherein the contact part is inclined toward an inner side in the radial direction to an outer side in a rotation axis direction of the fixing belt.

7. An image forming apparatus comprising:

an image forming part configured to form a toner image on a sheet; and

the fixing device, according to claim 1 , configured to fix the toner image on the sheet.