Alkyloxirane derivative, cosmetic material for hair, hydraulic oil composition, resin composition curable by actinic rays, and oil cleansing agent

Provided is an alkyloxirane derivative represented by formula (1). M H and M L calculated from the chromatogram obtained from the gel permeation chromatography measurement of the alkyloxirane derivative satisfy the relationship represented by formula (2). Z–[O–(AO)n–H]x … (1) (Z represents residues that remain after all hydroxyl groups are removed from a compound containing 1 to 22 carbon atoms and 1 to 6 hydroxyl groups. x represents a number of 1 to 6. AO represents an oxyalkylene group containing 3 carbon atoms. n represents a number of at least 25.) 0.35 ≤ M L /M H ≤ 0.75 … (2) (L represents the length of a vertical line extending from a maximum point K on the chromatogram, which represents the maximum magnitude of the refractive index, to a base line B. Points O and Q represent the two points on the chromatogram at which the magnitude of the refractive index becomes L/2, where the elution time is shorter at point O and the elution time is longer at point Q. M H is the distance between point O and intersection point P, and M L is the distance between point Q and intersection point P, when P is the point at which a straight line G connecting point O and point Q intersects with the vertical line extending from the maximum point K to the base line.)