An electric riding mower comprises two running motors (16) independently driving paired driving wheels (12, 13)； a mower blade mowing grass by being rotated； a mowing motor (15) rotating the mower blade； a battery (25) supplying electric power to the running motors (16) and the mowing motor (15)； and a mower-motor driver (MD) controlling the rotational speed of the mowing motor (15), wherein the mower-motor driver (MD) is disposed in a driver storage part (32, 33, 34, 35) on a front part of the mower and an air intake part (33SL) taking in external air is disposed on a front surface (33) of the driver storage part (32, 33, 34, 35). Especially, the electric riding mower further comprises a chassis (11)； and a plurality of the batteries (25), wherein the batteries (25) are disposed horizontally on a rear part of the chassis (11).
