A steering device 10 mounted on a vehicle includes: a steering body 12 having left and right sensors 22L and 22R installed in a rim 16 gripped by a driver to detect a driver's condition; and a detection circuit 14 configured to detect a driver's condition on the basis of a detection signal from at least the left and right sensors 22L and 22R, wherein a wire length Ll of a left harness 30L from the detection circuit 14 to the left sensor 22L is substantially equal to a wire length Lr of a right harness 30R from the detection circuit 14 to the right sensor 22R.