A two-cycle engine comprising: a cylinder block having a cylinder bore; an exhaust opening and scavenging opening (17, 18) formed on the inner peripheral wall of said cylinder bore; and a scavenging passage (10, 11) extending in the direction of the axial line of said cylinder bore and connecting said scavenging opening (17, 18) and a crank chamber communicating with said cylinder bore; characterised by an outflow direction change device (49, 54) provided in said scavenging passage (10, 11) for directing the outflow of an air-fuel mixture flowing out from near the top dead center of said scavenging opening (17, 18) into said cylinder bore and the outflow of the air-fuel mixture flowing out from near the bottom dead center of said scavenging opening (17, 18) into said cylinder bore in different directions when seen in the direction of the axial line of said cylinder bore wherein: said scavenging passage (17, 18) consists of an upper scavenging passage (42, 36) connected to said scavenging opening (17, 18) and extending in the direction from the top dead center to the bottom dead center and a lower scavenging passage (43, 37) having a width larger than the width at the lower end of said upper scavenging passage (42, 36) in the circumferential direction of said cylinder bore when seen in the direction of the axial line of said cylinder bore, connected to the lower end of said upper scavenging passage (42, 36), and extending toward said crank chamber, and said outflow direction change device (49, 54) is constituted by connecting said upper scavenging passage (42, 36) to said lower scavenging passage (43, 37) in the manner that the former is shifted with respect to the latter in the direction to the inside of said lower scavenging passage (43, 37) and away from said exhaust opening in the circumferential direction of said cylinder bore. a cylinder block having a cylinder bore; an exhaust opening and scavenging opening (17, 18) formed on the inner peripheral wall of said cylinder bore; and a scavenging passage (10, 11) extending in the direction of the axial line of said cylinder bore and connecting said scavenging opening (17, 18) and a crank chamber communicating with said cylinder bore; characterised by an outflow direction change device (49, 54) provided in said scavenging passage (10, 11) for directing the outflow of an air-fuel mixture flowing out from near the top dead center of said scavenging opening (17, 18) into said cylinder bore and the outflow of the air-fuel mixture flowing out from near the bottom dead center of said scavenging opening (17, 18) into said cylinder bore in different directions when seen in the direction of the axial line of said cylinder bore wherein: said scavenging passage (17, 18) consists of an upper scavenging passage (42, 36) connected to said scavenging opening (17, 18) and extending in the direction from the top dead center to the bottom dead center and a lower scavenging passage (43, 37) having a width larger than the width at the lower end of said upper scavenging passage (42, 36) in the circumferential direction of said cylinder bore when seen in the direction of the axial line of said cylinder bore, connected to the lower end of said upper scavenging passage (42, 36), and extending toward said crank chamber, and said outflow direction change device (49, 54) is constituted by connecting said upper scavenging passage (42, 36) to said lower scavenging passage (43, 37) in the manner that the former is shifted with respect to the latter in the direction to the inside of said lower scavenging passage (43, 37) and away from said exhaust opening in the circumferential direction of said cylinder bore. said scavenging passage (17, 18) consists of an upper scavenging passage (42, 36) connected to said scavenging opening (17, 18) and extending in the direction from the top dead center to the bottom dead center and a lower scavenging passage (43, 37) having a width larger than the width at the lower end of said upper scavenging passage (42, 36) in the circumferential direction of said cylinder bore when seen in the direction of the axial line of said cylinder bore, connected to the lower end of said upper scavenging passage (42, 36), and extending toward said crank chamber, and said outflow direction change device (49, 54) is constituted by connecting said upper scavenging passage (42, 36) to said lower scavenging passage (43, 37) in the manner that the former is shifted with respect to the latter in the direction to the inside of said lower scavenging passage (43, 37) and away from said exhaust opening in the circumferential direction of said cylinder bore.