PURPOSE: To obtain a yield-increasing agent of crops containing Brassinolides and at least one kind of compound selected from abcisic acid, benzyladenine, zeatine and jojoba oil as active ingredients and capable of providing stable yield-increasing effects.

CONSTITUTION: The aimed yield-increasing agent of crops containing (A) Brassinolides and (B) at least one kind of compound selected from abcisic acid, benzyladenine and zeatine which are vegetable hormones and jujube oil which is vegetable oil as active ingredients. When the agent is used, the active ingredient is directly diluted with water or carrier, spreader, dispersing agent, disintergrator, etc., are added thereto and the mixture may be formulated into forms of various kind of preparations. The blend obtained by blending ingredient A with ingredient B at a ratio of (1:1)-(1:50000) pts.wt. is preferably applied at an amount of 1-100mg per 10 a of ingredient A. The above-mentioned yield- increasing agent exhibits improvement of yield-increasing ratio excelling the ratio of the ingredient A alone.