A keyboard device includes a base plate, a circuit board and plural keys. The base plate includes plural fixing parts. Each of the plural fixing parts includes two extension structures, an opening and a guiding slot. Each key includes a keycap and a metallic elastic element. The keycap includes plural positioning parts. The base plate includes plural fixing parts. The plural positioning parts are connected with the plural fixing parts, respectively. Each positioning part includes a positioning bulge. The positioning bulge is introduced into the guiding slot of the fixing part through the opening of the fixing part, so that the keycap is fixed on the base plate. When the keycap is depressed, the positioning bulge of the positioning part is moved downwardly within the guiding slot, so that the keycap is moved toward the base plate.

An aerosol provision device includes a body and a button assembly on the body. The button assembly includes a button member, a support frame and a resilient arm. The resilient arm connects the support frame to the button member. A flexible sealing member extends between the support frame and the button member. Also disclosed are a button assembly for an aerosol provision device and a method of manufacturing a button assembly for an aerosol provision device.