A charger for a portable battery configured to be used in an electric vehicle comprising: a tray configured to get a battery placed in it, wherein the tray has a bottom surface portion which is formed in a length direction of the battery in a state of being placed in the charger, and side surface portions which rise from the bottom surface portion in a height direction of the battery in a state of being placed in the charger and face side surfaces of the battery in a width direction, wherein the charger further comprises an upper cover which covers a portion of the bottom surface portion and the side surface portions from above, characterized in that the charger further comprises an operation portion which is configured to allow a charger terminal to move between a connection position for connection to the battery and a retreat position for retreat from the battery, wherein the operation portion is configured to turn around a shaft in the width direction of the charger and is constituted to turn downward around the shaft due to a load from above, wherein the operation portion at the connection position is in a state of turning further upward around the shaft than the operation portion at the retreat position, wherein the charger further comprises a link which is configured to allow the charger terminal to move between the connection position and the retreat position, and wherein the link extends between a shaft serving as an action point for turning of the operation portion and the charger terminal and is configured to move in the length direction of the battery in the state of being placed when the operation portion is moved between the connection position and the retreat position. a tray configured to get a battery placed in it, wherein the tray has a bottom surface portion which is formed in a length direction of the battery in a state of being placed in the charger, and side surface portions which rise from the bottom surface portion in a height direction of the battery in a state of being placed in the charger and face side surfaces of the battery in a width direction, a bottom surface portion which is formed in a length direction of the battery in a state of being placed in the charger, and side surface portions which rise from the bottom surface portion in a height direction of the battery in a state of being placed in the charger and face side surfaces of the battery in a width direction, wherein the charger further comprises an upper cover which covers a portion of the bottom surface portion and the side surface portions from above, characterized in that the charger further comprises an operation portion which is configured to allow a charger terminal to move between a connection position for connection to the battery and a retreat position for retreat from the battery, wherein the operation portion is configured to turn around a shaft in the width direction of the charger and is constituted to turn downward around the shaft due to a load from above, wherein the operation portion at the connection position is in a state of turning further upward around the shaft than the operation portion at the retreat position, wherein the charger further comprises a link which is configured to allow the charger terminal to move between the connection position and the retreat position, and wherein the link extends between a shaft serving as an action point for turning of the operation portion and the charger terminal and is configured to move in the length direction of the battery in the state of being placed when the operation portion is moved between the connection position and the retreat position.