SECONDARY BATTERY

A secondary battery includes an outer package member, a battery device, a positive electrode terminal, a negative electrode terminal, and a fixing member. The outer package member has flexibility. The battery device has an elongated shape, and is contained inside the outer package member. The battery device includes a positive electrode and a negative electrode. The positive electrode terminal is coupled to the positive electrode, and is led out to an outside of the outer package member. The negative electrode terminal is coupled to the negative electrode, and is led out to the outside of the outer package member. The fixing member is disposed between the outer package member and the battery device, and is adhered to each of the outer package member and the battery device. The positive electrode and the negative electrode are opposed to each other and are wound in a first direction.