An electric tool is provided. The electric tool prevents anomalies in motor rotation due to dust and moisture sucked in together with a cooling wind, and is configured such that rotational position detection operations and switch operations are not affected. In the electric tool which drives a brushless DC motor using a controller, a magnetic body (14) for rotational position detection is provided on a rotation shaft (10) which can rotate integrally with a rotor (7), Hall ICs (41 to 43) are provided to detect the rotational position of the magnetic body and output a position signal to the controller, and the magnetic body (14) and the Hall ICs (41 to 43) mounted on a substrate (44) are arranged in a region isolated from the wind path of the cooling wind generated by rotation of a cooling fan. The Hall ICs (41 to 43) are accommodated in a housing (61) filled with resin.