A compression ignition internal combustion engine comprising: a cylinder block and a cylinder head; a piston including a cavity that defines a combustion chamber in cooperation with the cylinder block and the cylinder head; and a nozzle for injecting fuel into the combustion chamber, wherein the cavity includes: a raised portion raised toward the nozzle; a bottom surface formed around the raised portion; and an open surface (11, 12) and a reentrant surface (21, 22) that are continuous to the bottom surface, a depth of the open surface (11,12) becomes shallower toward a radially outer side of the piston, a distance from the nozzle to the open surface (11,12) is greater than a distance from the nozzle to the reentrant surface (21,22), a height position, in a central axis direction of the piston, of a ridgeline (111, 121) between the bottom surface and the open surface is lower than a height position, in the central axis direction of the piston, of a ridgeline (211, 221) between the bottom surface and the reentrant surface, the nozzle injects first and second fuel sprays (F11, F12, F21, F22) toward the open surface and the reentrant surface, respectively, the nozzle injects a third fuel spray (F31, F32) towards the open surface and between the first and second fuel sprays, the nozzle injects a fourth fuel spray (F41, F42) sandwiching the first fuel spray in cooperation with the third fuel spray, the fourth fuel spray being injected towards the open surface, and when the piston is viewed in the central axis direction, a distance to the nozzle from a point where an outer circumferential edge of the open surface intersects a direction of the third fuel spray (F31,F32) is greater than a distance to the nozzle from a point where the outer circumferential edge of the open surface intersects a direction of the fourth fuel spray (F41,F42). a cylinder block and a cylinder head; a piston including a cavity that defines a combustion chamber in cooperation with the cylinder block and the cylinder head; and a nozzle for injecting fuel into the combustion chamber, wherein the cavity includes: a raised portion raised toward the nozzle; a bottom surface formed around the raised portion; and an open surface (11, 12) and a reentrant surface (21, 22) that are continuous to the bottom surface, a raised portion raised toward the nozzle; a bottom surface formed around the raised portion; and an open surface (11, 12) and a reentrant surface (21, 22) that are continuous to the bottom surface, a depth of the open surface (11,12) becomes shallower toward a radially outer side of the piston, a distance from the nozzle to the open surface (11,12) is greater than a distance from the nozzle to the reentrant surface (21,22), a height position, in a central axis direction of the piston, of a ridgeline (111, 121) between the bottom surface and the open surface is lower than a height position, in the central axis direction of the piston, of a ridgeline (211, 221) between the bottom surface and the reentrant surface, the nozzle injects first and second fuel sprays (F11, F12, F21, F22) toward the open surface and the reentrant surface, respectively, the nozzle injects a third fuel spray (F31, F32) towards the open surface and between the first and second fuel sprays, the nozzle injects a fourth fuel spray (F41, F42) sandwiching the first fuel spray in cooperation with the third fuel spray, the fourth fuel spray being injected towards the open surface, and when the piston is viewed in the central axis direction, a distance to the nozzle from a point where an outer circumferential edge of the open surface intersects a direction of the third fuel spray (F31,F32) is greater than a distance to the nozzle from a point where the outer circumferential edge of the open surface intersects a direction of the fourth fuel spray (F41,F42).