Autonomous cleaner, auxiliary brush therefor, and cleaner system equipped with autonomous cleaner

This autonomous cleaner (10) is provided with a body (20) and an auxiliary brush (100). The auxiliary brush (100) is attached to the body (20) in such a manner as to be able to collect litter to a suction opening (20B) provided in a bottom face (20A) of the body (20), and comprises a short-length bristle bundle (141) and a long-length bristle bundle (142). The short-length bristle bundle (141) isa bundle of short bristles. The long-length bristle bundle (142) is a bundle of bristles that are longer than the bristles in the short-length bristle bundle (141). This configuration provides an autonomous cleaner (10) and an auxiliary brush (100) that are able to scrounge litter efficiently. 自主行走型吸尘器(10)具备本体(20)和辅助刷(100)。辅助刷(100)被安装于本体(20)，使得能够将垃圾收集到在本体(20)的底面(20A)设置的吸入口(20B)，该辅助刷(100)包括短条刷毛束(141)和长条刷毛束(142)。短条刷毛束(141)是短刷毛的集束。长条刷毛束(142)是比短条刷毛束(141)的刷毛长的刷毛的集束。由此，提供种能够有效地收集垃圾的自主行走型吸尘器(10)及其辅助刷(100)。