A flashlight includes a body, a battery pack held in the body, a rear cover joined on the body, and a push-button switch in the rear cover; the push-button switch includes positive and negative electrodes, and a button part facing a through hole of the rear cover; the battery pack includes a casing, a battery set in the casing, and a socket facing a through hole of the casing; the battery pack includes positive and negative electrodes, which are connected to positive and negative electrodes of the socket; a first elastic component is positioned between and connected to the positive electrodes of the push-button switch and the battery pack; a second elastic component is positioned between and connected to the negative electrodes of the switch and the battery pack; the battery pack can be charged through a charger plugged in the socket while it is still held in the body.