Optical film, polarizer, and liquid crystal display device

The present invention addresses the problem of providing an optical film in which bleed out is inhibited, and which has low internal haze, and exhibits excellent brittleness, high retardation development properties, light resistance, and wet heat resistance. This optical film contains a thermoplastic resin, and a compound represented by general formula (1). (In general formula (1), X 1 represents an oxygen atom or a sulfur atom; Y 1 represents an oxygen atom, a sulfur atom, a nitrogen atom, or NR 41 ; Z 1 represents an oxygen atom, a nitrogen atom, or a sulfur atom; R 11 , R 21 and R 31 represent a substituent; R 41 represents a hydrogen atom or a substituent; k1 represents an integer between 1 and 5; m1 represents an integer between 0 and 4; n1 represents an integer between 0 and 4; and the dash line represents a single bond or a double bond.)