A machine oil composition for agrochemicals which comprises a base oil (A) satisfying the following requirements (A1) to (A3) and an emulsifier (B) having an HLB value, as determined by the Griffin method, of 9.0-10.0. Requirement (A1): to have a 40°C dynamic viscosity of 7.0-10.0 mm2/s Requirement (A2): to have a %CA, as determined by ring analysis (n-d-M method), less than 0.5 Requirement (A3): to have an aniline point of 90-110°C