A cutting insert comprising: a top surface having a polygonal shape in a top view, and comprising a first corner portion with an acute angle (θ1) and a second corner portion with an obtuse angle (θ2); a bottom surface; a side surface located between the top surface and the bottom surface; and a top cutting edge disposed along a ridge line at an intersection between the top surface and the side surface, and comprising: a first corner cutting edge located in the first corner portion; a first major cutting edge adjacent to the first corner cutting edge; a second corner cutting edge located in the second corner portion; and a second major cutting edge adjacent to the second corner cutting edge; wherein the top surface further comprises: a first breaker protrusion protruding toward the first corner portion; and a second breaker protrusion protruding toward the second corner portion; wherein a gap between the first breaker protrusion and the first major cutting edge becomes larger as a distance from the first corner cutting edge increases, and a gap between the second breaker protrusion and the second major cutting edge becomes smaller as a distance from the second corner cutting edge increases in a top view, characterised in that a gap between the first breaker protrusion and the first corner cutting edge is larger than a gap between the second breaker protrusion and the second corner cutting edge in a top view. a top surface having a polygonal shape in a top view, and comprising a first corner portion with an acute angle (θ1) and a second corner portion with an obtuse angle (θ2); a bottom surface; a side surface located between the top surface and the bottom surface; and a top cutting edge disposed along a ridge line at an intersection between the top surface and the side surface, and comprising: a first corner cutting edge located in the first corner portion; a first major cutting edge adjacent to the first corner cutting edge; a second corner cutting edge located in the second corner portion; and a second major cutting edge adjacent to the second corner cutting edge; a first corner cutting edge located in the first corner portion; a first major cutting edge adjacent to the first corner cutting edge; a second corner cutting edge located in the second corner portion; and a second major cutting edge adjacent to the second corner cutting edge; wherein the top surface further comprises: a first breaker protrusion protruding toward the first corner portion; and a second breaker protrusion protruding toward the second corner portion; a first breaker protrusion protruding toward the first corner portion; and a second breaker protrusion protruding toward the second corner portion; wherein a gap between the first breaker protrusion and the first major cutting edge becomes larger as a distance from the first corner cutting edge increases, and a gap between the second breaker protrusion and the second major cutting edge becomes smaller as a distance from the second corner cutting edge increases in a top view, characterised in that a gap between the first breaker protrusion and the first corner cutting edge is larger than a gap between the second breaker protrusion and the second corner cutting edge in a top view.