PURPOSE: To provide an industrial robot which rationally manages wear of the working line material of a mechanism for a robot work.

CONSTITUTION: The number of bending and straightening times at a longitudinal section of a transmission line material 5 is computed by means of an output from an operation detecting device 6 responding to elevating operation of a first actuating body 2. When a longitudinal section where the number of bending and straightening times exceeds a limit value is generated, a control device 8 is operated to display first abnormality. When the longitudinal section, where the number of bending and straightening times exceeds a given value lower than the limit value, of the transmission line material 5 is produced, an elongation amount of the transmission line material 5 is computed from an output from a position detecting device 7. When an elongation amount exceeds a given value, the control device 8 is operated to display second abnormality.