A portable blower includes a casing (2) having an intake port (6) and a discharge port (7); an air passage (8) provided inside the casing (2) and connecting between the intake port (6) and the discharge port (7); a blower fan (17) arranged inside the air passage (8); a filter (16) arranged at the intake port (6); and a lid portion (3) openably fitted to the casing (2), the lid portion (3), when open, exposing the intake port (6) and, when closed, covering the intake port (6). When open, the lid portion (3) supports the casing (2) to let it stand on a table top. As the blower fan (17) is operated, outside air is introduced through the intake port (6) into the air passage (8) so as to be sent out through the discharge port (7).