A portable cutting machine is provided with: a cutting machine main body (3); a saw blade (1) provided rotatably with respect to the cutting machine main body (3); an electric motor (2) adapted to drive the saw blade (1); a handle (4) which is provided between the saw blade (1) and the electric motor (2) in a first direction parallel to a rotation shaft (9) of the saw blade (1) and extends in a second direction perpendicular to the first direction; a battery pack (5) adapted to drive the electric motor (2); and a surface plate (6) rotatably supported by the cutting machine main body (3). A center in the first direction of the battery pack (5) is located closer to a side of the electric motor (2) than a center in the first direction of the handle (4). The rotation shaft (9) of the saw blade (1) is located on one side of the surface plate (6). A part of the saw blade (1) passes through an opening portion (16) penetrating through the surface plate (6) and is exposed to the other side of the surface plate (6). A projecting amount of the saw blade (1) by which the part of the saw blade (1) projects from the other side of the surface plate (6) is changeable by changing an angle of the surface plate (6) with respect to the cutting machine main body (3). A cutting-depth adjusting mechanism adapted to change the angle of the surface plate (6) with respect to the cutting machine main body (3) is located, in the first direction, closer to a side of the saw blade (1) than the battery pack (5).