Portable vacuum cleaner comprising a vacuum cleaner casing, a handle connected to the vacuum cleaner casing, a suction inlet through which air can be suctioned by the portable vacuum cleaner, at least one exhaust orifice through which clean air can exit from the portable vacuum cleaner, an aeraulic circuit which extends between the suction inlet and the exhaust orifice, a suction unit disposed on the aeraulic circuit, the suction unit comprising an electric motor (7.1) and a ventilator (7.2) coupled to the electric motor (7.1) to generate an airflow in the aeraulic circuit from the suction inlet to the exhaust orifice, a waste separation device disposed on the aeraulic circuit upstream from the suction unit and which is passed through by an airflow generated by the suction unit when the portable vacuum cleaner is in operation, a removable bowl intended to receive waste separated by the waste separation device and which is removably attached to the vacuum cleaner casing, a suction unit casing comprising a first wall (12.3) which covers, at least partially, the suction unit, wherein the suction unit casing comprises a second wall (12.4) which covers, at least partially, the first wall (12.3), and in that the second wall (12.4) is formed at a distance from the first wall (12.3) to delimit, at least partially, an internal space of the portable vacuum cleaner which extends between the first wall (12.3) and the second wall (12.4), characterised in that the electric motor (7.1) comprises an outlet shaft (7.3) having an axis of rotation, the outlet shaft (7.3) being coupled to the ventilator (7.2), and wherein the first wall (12.3) and the second wall (12.4) are of partially annular shapes about the axis of rotation, the first wall (12.3) and the second wall (12.4) delimiting an internal space of partially annular shape around the suction unit. a vacuum cleaner casing, a handle connected to the vacuum cleaner casing, a suction inlet through which air can be suctioned by the portable vacuum cleaner, at least one exhaust orifice through which clean air can exit from the portable vacuum cleaner, an aeraulic circuit which extends between the suction inlet and the exhaust orifice, a suction unit disposed on the aeraulic circuit, the suction unit comprising an electric motor (7.1) and a ventilator (7.2) coupled to the electric motor (7.1) to generate an airflow in the aeraulic circuit from the suction inlet to the exhaust orifice, a waste separation device disposed on the aeraulic circuit upstream from the suction unit and which is passed through by an airflow generated by the suction unit when the portable vacuum cleaner is in operation, a removable bowl intended to receive waste separated by the waste separation device and which is removably attached to the vacuum cleaner casing, a suction unit casing comprising a first wall (12.3) which covers, at least partially, the suction unit, wherein the suction unit casing comprises a second wall (12.4) which covers, at least partially, the first wall (12.3), and in that the second wall (12.4) is formed at a distance from the first wall (12.3) to delimit, at least partially, an internal space of the portable vacuum cleaner which extends between the first wall (12.3) and the second wall (12.4), characterised in that the electric motor (7.1) comprises an outlet shaft (7.3) having an axis of rotation, the outlet shaft (7.3) being coupled to the ventilator (7.2), and wherein the first wall (12.3) and the second wall (12.4) are of partially annular shapes about the axis of rotation, the first wall (12.3) and the second wall (12.4) delimiting an internal space of partially annular shape around the suction unit.