Lens mount, photographing apparatus, photographing system and movable object

A photographing system, comprising:

• a photographing apparatus including an image sensor;
• and
• a lens mount, including:
• a ring-shaped fixing member fixed to the photographing apparatus, including a first surface,
• a ring-shaped movable member, including:
• a second protrusion portion engageable with a first protrusion portion of an interchangeable lens, and
• a second surface rotatably contacting the first surface, and
• a force application member, applying a force to the movable member towards the fixing member, wherein
• at least one of the first surface or the second surface includes an inclined surface having an angle with respect to a rotation direction of the movable member, and
• when the lens mount is fixed to the photographing apparatus,
• the ring-shaped movable member is closer to an image-taking-surface side of the photographing apparatus than the fixing member,
• the force application member is closer to the image-taking-surface side than the movable member, and
• when the movable member rotates in a first direction of the rotation direction, the movable member slides along the included surface and moves towards the image-taking-surface side, and the second protrusion portion presses the first protrusion portion towards the image-taking-surface side, thereby fixing the interchangeable lens to the photographing apparatus.