A work machine operation mechanism (3, 4) inclining a first pedal (1c, 1d) and a second pedal (1e, 1f) based on a drive command, the first pedal (1c, 1d) and the second pedal (1e, 1f) being for controlling an action of a work machine in accordance with inclination, the work machine operation mechanism (3, 4) comprising: a driving source (30, 31, 40, 41) which generates a driving force based on the drive command; a first pedal driving mechanism which inclines the first pedal (1c, 1d); a second pedal driving mechanism which inclines the second pedal (1e, 1f); and a transmission mechanism (33, 35, 44, 45) which transmits the driving force from the driving source (30, 31, 40, 41) to the first pedal driving mechanism and the second pedal driving mechanism, wherein at least one of the first pedal driving mechanism and the second pedal driving mechanism is arranged apart from the driving source (30, 31, 40, 41), characterized in that the first pedal driving mechanism has a first abutting portion which abuts a pedal surface of the first pedal (1c, 1d) as a surface which is stepped on when an operator performs an operation and a first driving unit which inclines the first pedal (1c, 1d) by inclining the first abutting portion, the second pedal driving mechanism has a second abutting portion which abuts a pedal surface of the second pedal (1e, 1f) as a surface which is stepped on when the operator performs an operation and a second driving unit which inclines the second pedal (1e, 1f) by inclining the second abutting portion, at least one of the first driving unit and the second driving unit has a speed reducer which includes a first gear and a second gear, and the first gear and the second gear are arranged to be arrayed in an up-down direction. a driving source (30, 31, 40, 41) which generates a driving force based on the drive command; a first pedal driving mechanism which inclines the first pedal (1c, 1d); a second pedal driving mechanism which inclines the second pedal (1e, 1f); and a transmission mechanism (33, 35, 44, 45) which transmits the driving force from the driving source (30, 31, 40, 41) to the first pedal driving mechanism and the second pedal driving mechanism, wherein at least one of the first pedal driving mechanism and the second pedal driving mechanism is arranged apart from the driving source (30, 31, 40, 41), characterized in that the first pedal driving mechanism has a first abutting portion which abuts a pedal surface of the first pedal (1c, 1d) as a surface which is stepped on when an operator performs an operation and a first driving unit which inclines the first pedal (1c, 1d) by inclining the first abutting portion, the second pedal driving mechanism has a second abutting portion which abuts a pedal surface of the second pedal (1e, 1f) as a surface which is stepped on when the operator performs an operation and a second driving unit which inclines the second pedal (1e, 1f) by inclining the second abutting portion, at least one of the first driving unit and the second driving unit has a speed reducer which includes a first gear and a second gear, and the first gear and the second gear are arranged to be arrayed in an up-down direction.