Flush toilet

1. A flush toilet, comprising:

a bowl part that receives waste; and

a water storage part that is formed on a bottom of the bowl part and stores a stored water, wherein

the water storage part includes a front surface part, a back surface part that is formed on a back side of the front surface part, and a pair of side surface parts that are formed between the front surface part and the back surface part, and

on at least one side surface part in the pair of side surface parts, a convex surface that protrudes toward another side surface part is formed.

2. The flush toilet according to claim 1 , wherein

a first region that is connected to a discharge channel and a second region that is located on a front side of the first region are formed in the water storage part, and

the convex surface is formed over the first region to the second region.

3. The flush toilet according to claim 2 , wherein

a vertex of the convex surface is located at a boundary between the first region and the second region.

4. The flush toilet according to claim 1 , wherein

the convex surface is formed along upward and downward directions.

5. The flush toilet according to claim 2 , wherein

a surface area of the first region in directions that are orthogonal to upward and downward directions is greater than a surface area of the second region in the directions that are orthogonal.

6. The flush toilet according to claim 1 , wherein

the convex surface is respectively formed on the pair of side surface parts.