Timepiece

A timepiece comprising:

• a timepiece case forming a ring shape;
• a back cover having a projecting part that projects on a front-side surface of the back cover;
• and
• a fixing member for fixing the back cover to the timepiece case, the fixing member forming a ring shape that extends along a peripheral direction of an inner peripheral part of the timepiece case,
• the timepiece case being made of a harder material than the fixing member,
• the fixing member being compressed and deformed between the inner peripheral part of the timepiece case and the projecting part of the back cover,
• the projecting part of the back cover having a first taper part, a first constant outer diameter part, a second taper part, and a second constant outer diameter part in this order in a first direction directing from a front side of the timepiece to a back side of the timepiece,
• the first taper part being formed on a front-side part of an outer peripheral part of the projecting part and having an outer diameter gradually increasing as moving in the first direction,
• the first constant outer diameter part being formed directly next to the first taper part in the first direction with respect to the first taper part and having a constant outer diameter equal to a maximum outer diameter of the first taper part,
• the second taper part being formed directly next to the first constant outer diameter part in the first direction with respect to the first constant outer diameter part and having an outer diameter gradually increasing as moving in the first direction, a minimum outer diameter of the second taper part being equal to the outer diameter of the first constant outer diameter part, and
• the second constant outer diameter part being formed directly next to the second taper part in the first direction with respect to the second taper part and having a constant outer diameter equal to a maximum outer diameter of the second taper part.