TWO-CYCLE INTERNAL COMBUSTION ENGINE AND ENGINE WORK MACHINE

Provided is a two-stroke internal combustion engine, including: a fuel injection valve (25) configured to supply a fuel into a crank chamber (8); an intake passage (17) configured to allow only air to be sucked thereinto under a negative pressure generated when a piston (4) is actuated; and a scavenging passage (18) that allows communication between the crank chamber (8) and a combustion chamber (6). Further, air passing through the intake passage (17) is introduced into the scavenging passage (18), and air stagnant in the scavenging passage (18) at end of air suction contributes to scavenging.