ELECTRIC POWER TOOL AND BATTERY PACK

Provided are an electric tool that may reduce the chances of causing a malfunction to its battery pack and such a battery pack. An electric tool (1) includes a body portion (10), a grip portion (20), and a battery pack (30). The body portion (10) includes: a tool attachment member (11) to which a tool (40) is attached; a driving unit (12) to drive the tool (40); and a transmission unit (13) to transmit driving force of the driving unit (12) to the tool (40). The grip portion (20) is provided for the body portion (10) and includes a gripping part (21) to be held by a user with his or her hand. The battery pack (30) supplies power to the driving unit (12). The battery pack (30) includes an all-solid-state battery (35).