A two-cycle engine comprising: a piston capable of reciprocating along a cylinder , the piston being provided with piston rings ; and a lubrication port provided in the cylinder , the lubrication port being used to supply a lubricant to a sliding surface of the cylinder on which the piston rings slide, wherein inter-ring spaces (S) are provided, each inter-ring space (S) being between adjacent piston rings , the piston reciprocates between a bottom dead center and a top dead center, the lubrication port is capable of supplying the lubricant to the upper side of the uppermost piston ring of the piston positioned at the bottom dead center and is capable of supplying the lubricant to the lower side of the lowermost piston ring of the piston positioned at the top dead center, the two-cycle engine comprises a lubrication period-adjusting device used to adjust a first lubrication period of lubricating from the lubrication port during movement of the piston toward the top dead center thereof, so that a period before an uppermost inter-ring space (S) passing by the lubrication port is excluded from the first lubrication period and a period in which at least part of a lowermost inter-ring space faces the lubrication port is included in the first lubrication period, and the lubrication period-adjusting device sets a second lubrication period after the first lubrication period based on an engine rotational speed, characterized in that the piston includes a piston skirt , and the lubrication period-adjusting device adjusts the second lubrication period to include a period in which at least part of the piston skirt faces the lubrication port . a piston capable of reciprocating along a cylinder , the piston being provided with piston rings ; and a lubrication port provided in the cylinder , the lubrication port being used to supply a lubricant to a sliding surface of the cylinder on which the piston rings slide, wherein inter-ring spaces (S) are provided, each inter-ring space (S) being between adjacent piston rings , the piston reciprocates between a bottom dead center and a top dead center, the lubrication port is capable of supplying the lubricant to the upper side of the uppermost piston ring of the piston positioned at the bottom dead center and is capable of supplying the lubricant to the lower side of the lowermost piston ring of the piston positioned at the top dead center, the two-cycle engine comprises a lubrication period-adjusting device used to adjust a first lubrication period of lubricating from the lubrication port during movement of the piston toward the top dead center thereof, so that a period before an uppermost inter-ring space (S) passing by the lubrication port is excluded from the first lubrication period and a period in which at least part of a lowermost inter-ring space faces the lubrication port is included in the first lubrication period, and the lubrication period-adjusting device sets a second lubrication period after the first lubrication period based on an engine rotational speed, characterized in that the piston includes a piston skirt , and the lubrication period-adjusting device adjusts the second lubrication period to include a period in which at least part of the piston skirt faces the lubrication port . <EOS>