An electrostatic precipitator comprising: a charging unit comprising a discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) comprising a plurality of electrically conductive fibers and provided to generate and diffuse ions by a discharge, and ground electrodes (22, 22a, 22b, 22c) maintained at a ground potential and provided to attract the ions generated and diffused by the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) to charge suspended fine particles contained in a processing airflow by the ions, and a dust collecting unit provided to collect dust by adhering the suspended fine particles charged by the charging unit, and wherein the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) is disposed between two adjacent ground electrodes (22, 22a, 22b, 22c) in the processing airflow, and the plurality of electrically conductive fibers of the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) is disposed on a downstream side of the processing airflow further than an end portion of the ground electrodes (22, 22a, 22b, 22c) on an upstream side of the processing airflow, and, characterized in that the ground electrodes (22, 22a, 22b, 22c) comprise a first electrode part (25, 25a, 25b, 25c) of a plate shape disposed in a direction of being parallel to the processing airflow and a second electrode part (26, 26a, 26b, 26c) of a plate shape disposed in a direction of crossing the processing airflow, and that an end portion of the first electrode part located on the upstream side of the processing airflow and a central portion of the second electrode part are joined such that the first electrode part (25, 25a, 25b, 25c) and the second electrode part (26, 26a, 26b, 26c) of the ground electrodes (22, 22a, 22b, 22c) form a T-shape. a charging unit comprising a discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) comprising a plurality of electrically conductive fibers and provided to generate and diffuse ions by a discharge, and ground electrodes (22, 22a, 22b, 22c) maintained at a ground potential and provided to attract the ions generated and diffused by the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) to charge suspended fine particles contained in a processing airflow by the ions, and a dust collecting unit provided to collect dust by adhering the suspended fine particles charged by the charging unit, and wherein the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) is disposed between two adjacent ground electrodes (22, 22a, 22b, 22c) in the processing airflow, and the plurality of electrically conductive fibers of the discharge electrode (21, 21a, 21b, 21c, 21d, 21e, 21f) is disposed on a downstream side of the processing airflow further than an end portion of the ground electrodes (22, 22a, 22b, 22c) on an upstream side of the processing airflow, and, characterized in that the ground electrodes (22, 22a, 22b, 22c) comprise a first electrode part (25, 25a, 25b, 25c) of a plate shape disposed in a direction of being parallel to the processing airflow and a second electrode part (26, 26a, 26b, 26c) of a plate shape disposed in a direction of crossing the processing airflow, and that an end portion of the first electrode part located on the upstream side of the processing airflow and a central portion of the second electrode part are joined such that the first electrode part (25, 25a, 25b, 25c) and the second electrode part (26, 26a, 26b, 26c) of the ground electrodes (22, 22a, 22b, 22c) form a T-shape.