CYLINDRICAL BATTERY

In a cylindrical battery including a gap formed between a peripheral side surface of a dish-shaped portion in an anode terminal plate and a curved end portion of a cathode can , and a washer having a washer boss portion and an annular flange portion provided around an upper end surface of the washer boss portion , the washer being mounted to an opening portion of a cathode can such that the washer boss portion is fitted into the gap , a vent structure configured to release gas released to the gap from a first vent hole in the anode terminal plate is provided in a range surrounded by a ridge line connecting a highest part of the curved end portion in the washer and the peripheral side surface of the anode terminal plate