Lawn mower

A lawn mower, comprising:

• a work unit including a housing having a downward-facing opening and a cutter blade rotatably provided in the housing such that when rotated, the cutter blade cuts grass and generates a transport air flow flowing from the opening of the housing to an inside;
• a grass clippings receptacle configured to receive grass clippings cut by the work unit;
• a grass clippings transport passage connecting an interior of the housing with the grass clippings receptacle;
• a shutter device including a shutter configured to selectively open and close the grass clippings transport passage and an actuator configured to drive the shutter;
• a controller configured to control the shutter device;
• and
• a pressure sensor provided in the grass clippings transport passage to detect a pressure in the grass clippings transport passage,
• wherein the controller is configured to control the shutter device based on the pressure detected by the pressure sensor,
• wherein the pressure sensor is located in a part of the grass clippings transport passage between the shutter and an end of the grass clippings transport passage on a side of the grass clippings receptacle, and
• wherein the controller is configured to fully close the shutter in a case where the pressure detected by the pressure sensor is lower than or equal to a predetermined first threshold pressure at a time after a predetermined transition period has elapsed from a start of driving of the work unit.