A mower (10, 100) is provided with a swirling part (11d), which permits grass clipping to swirl in an enclosure (11) and leads the grass clipping to a discharge passage (21). Guide parts (7, 170) arranged under a top plate (11a) of the enclosure are arranged along the swirling part. Back guide ends (71, 171) of the guide parts are opposite to an opening of a channel of the enclosure facing the grass clipping discharge passage. Direction of swirling flow is gradually changed, and swirling flow is led to the opening of the channel through the guide parts.