PROBLEM TO BE SOLVED: To provide an inclination detection system for a farm work machine which accurately detects an inclination of a farm work machine mounted on a tractor and performing farm work.SOLUTION: The inclination detection system for a farm work machine detects an inclination of a farm work machine 2 mounted on a tractor 1 and performing farm work and includes: a level 25 arranged on the farm work machine 2 an inclination sensor 23 arranged on the farm work machine 2 and a display 10 acquiring information of the inclination sensor 23 remotely. The display 10 includes: a setting switch 16 setting a reference and a display part 14 displaying an inclination state of the farm work machine 2 based on the information from the inclination sensor 23 and the reference set by the setting switch 16.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT