A working system , comprising: multiple modules constituting a work line; a moving body configured to move alongside a line in which multiple modules are lined up to replenish necessary members to each of the modules , wherein the moving body includes a sensor configured to detect presence of an interfering object; and a line constituent member constituting a part of the work line, characterized in that: the line constituent member is installable on the moving path of the moving body and has a light projecting section configured to project light toward the moving body along the moving path of the moving body ; wherein the moving body is further comprised of: a light receiving section configured to receive light from the light projecting section , and a control section configured to monitor for the presence of the interfering object within a detection range of the sensor and, in a case of the line constituent member being installed on the moving path of the moving body , the control section stops the movement of the moving body when the interfering object is detected while monitoring for the presence of the interfering object on the moving path to the line constituent member based on a state of light received from the light receiving section ; wherein the control section is capable of switching the detection range of the sensor between a first detection range and a second detection range that is smaller than the first detection range. multiple modules constituting a work line; a moving body configured to move alongside a line in which multiple modules are lined up to replenish necessary members to each of the modules , wherein the moving body includes a sensor configured to detect presence of an interfering object; and a line constituent member constituting a part of the work line, characterized in that: the line constituent member is installable on the moving path of the moving body and has a light projecting section configured to project light toward the moving body along the moving path of the moving body ; wherein the moving body is further comprised of: a light receiving section configured to receive light from the light projecting section , and a control section configured to monitor for the presence of the interfering object within a detection range of the sensor and, in a case of the line constituent member being installed on the moving path of the moving body , the control section stops the movement of the moving body when the interfering object is detected while monitoring for the presence of the interfering object on the moving path to the line constituent member based on a state of light received from the light receiving section ; wherein the control section is capable of switching the detection range of the sensor between a first detection range and a second detection range that is smaller than the first detection range. a light receiving section configured to receive light from the light projecting section , and a control section configured to monitor for the presence of the interfering object within a detection range of the sensor and, in a case of the line constituent member being installed on the moving path of the moving body , the control section stops the movement of the moving body when the interfering object is detected while monitoring for the presence of the interfering object on the moving path to the line constituent member based on a state of light received from the light receiving section ; wherein the control section is capable of switching the detection range of the sensor between a first detection range and a second detection range that is smaller than the first detection range. <EOS>