A remote operation system (1A, 1B, 1C), comprising: an image capturing device, configured to be disposed at a forklift at a place separate from an operator; a head-mounted type image display device, adapted to be mounted to a head of the operator; a command reception device, adapted to be disposed within reach of a hand of the operator and receiving a remote operation command by the operator; and the remote operation system (1A, 1B, 1C) characterized in further comprising: a synthesized remote image generation device (12A, 21B, 60), obtaining a content of the remote operation command received by the command reception device, an action state of the forklift acting in accordance with the remote operation command, and a remote image captured by the image capturing device, and generating a synthesized remote image by synthesizing a command display image indicating the content of the remote operation command and an action display image indicating the action state of the forklift into the remote image, wherein the head-mounted type image display device displays the synthesized remote image that is generated by the synthesized remote image generation device (12A, 21B, 60) before eyes of the operator, wherein the head-mounted type image display device comprises a posture detection part detecting a posture of the head of the operator, the synthesized remote image generation device (12A, 21B, 60) obtains the posture detected by the posture detection part, and generates the synthesized remote image by synthesizing the command display image and the action display image into a portion of the remote image that is cut out in accordance with the posture, wherein a size of the portion of the remote image is unchanged in response to change of the posture. an image capturing device, configured to be disposed at a forklift at a place separate from an operator; a head-mounted type image display device, adapted to be mounted to a head of the operator; a command reception device, adapted to be disposed within reach of a hand of the operator and receiving a remote operation command by the operator; and the remote operation system (1A, 1B, 1C) characterized in further comprising: a synthesized remote image generation device (12A, 21B, 60), obtaining a content of the remote operation command received by the command reception device, an action state of the forklift acting in accordance with the remote operation command, and a remote image captured by the image capturing device, and generating a synthesized remote image by synthesizing a command display image indicating the content of the remote operation command and an action display image indicating the action state of the forklift into the remote image, wherein the head-mounted type image display device displays the synthesized remote image that is generated by the synthesized remote image generation device (12A, 21B, 60) before eyes of the operator, wherein the head-mounted type image display device comprises a posture detection part detecting a posture of the head of the operator, the synthesized remote image generation device (12A, 21B, 60) obtains the posture detected by the posture detection part, and generates the synthesized remote image by synthesizing the command display image and the action display image into a portion of the remote image that is cut out in accordance with the posture, wherein a size of the portion of the remote image is unchanged in response to change of the posture. a synthesized remote image generation device (12A, 21B, 60), obtaining a content of the remote operation command received by the command reception device, an action state of the forklift acting in accordance with the remote operation command, and a remote image captured by the image capturing device, and generating a synthesized remote image by synthesizing a command display image indicating the content of the remote operation command and an action display image indicating the action state of the forklift into the remote image, wherein the head-mounted type image display device displays the synthesized remote image that is generated by the synthesized remote image generation device (12A, 21B, 60) before eyes of the operator, wherein the head-mounted type image display device comprises a posture detection part detecting a posture of the head of the operator, the synthesized remote image generation device (12A, 21B, 60) obtains the posture detected by the posture detection part, and generates the synthesized remote image by synthesizing the command display image and the action display image into a portion of the remote image that is cut out in accordance with the posture, wherein a size of the portion of the remote image is unchanged in response to change of the posture.