Cutting insert, cutting tool, and method of manufacturing machined product

A cutting insert, comprising:

• a base body;
• and
• a coating layer located on a surface of the base body,
• wherein the cutting insert comprises a rake surface, a flank surface, and a cutting edge located along an intersecting ridge between the rake surface and the flank surface,
• the rake surface comprises an outer peripheral part adjacent to the cutting edge and a middle part protruded relative to the outer peripheral part,
• the middle part comprises a contacting surface,
• the outer peripheral part comprises a first breaker part close to the cutting edge, a third breaker part adjacent to the contacting surface and a second part located between the first breaker part and the third breaker part, the coating layer doesn't exist at the contacting surface,
• a skewness (Rsk) of a roughness curve at the contacting surface is −1.5 μm to −0.5 μm, a skewness (Rsk) of a roughness curve at the third breaker part is −0.2 μm or less, and
• the skewness (Rsk) of a roughness curve at the contacting surface is smaller than the skewness (Rsk) of a roughness curve at the third breaker part.