An electrical connector to be mounted on an electrical circuit board, and to be connected to a flat conductive member, comprising: a housing including a receiving portion for inserting the flat conductive member therein; a plurality of terminals (20, 30) arranged in the housing in a terminal arrangement direction; and a movable member, wherein said movable member is configured to be supported on the housing so that the movable member is movable between a passage allowing position and a pulling out preventing position relative to the housing, said movable member includes an operation portion and a display portion, wherein said display portion is configured to be able to protrude and retract relative to an outer surface of the housing different from a surface where the operation portion is disposed, the operation portion is arranged to move the movable member from the pulling out preventing position to the passage allowing position, the movable member further includes an interfering portion and an engaging portion disposed outside a terminal arrangement range in the terminal arrangement direction, the interfering portion is configured to interfere with the flat conductive member when the flat conductive member is inserted into the electrical connector so that the movable member is moved to the passage allowing position, and the engaging portion is configured to engage with an engaged portion (C2A) formed in the flat conductive member at the pulling out preventing position when the flat conductive member is completely inserted into the electrical connector, wherein said movable member further includes a rotational axis portion so that the movable member is movable around the rotational axis portion between the passage allowing position and the pulling out preventing position, characterized in that the operation portion is disposed opposite to the display portion relative to the rotational axis portion and in that the display portion protrudes from said outer surface in the pulling out preventing position, but does not protrude from said outer surface in the passage allowing position. a housing including a receiving portion for inserting the flat conductive member therein; a plurality of terminals (20, 30) arranged in the housing in a terminal arrangement direction; and a movable member, wherein said movable member is configured to be supported on the housing so that the movable member is movable between a passage allowing position and a pulling out preventing position relative to the housing, said movable member includes an operation portion and a display portion, wherein said display portion is configured to be able to protrude and retract relative to an outer surface of the housing different from a surface where the operation portion is disposed, the operation portion is arranged to move the movable member from the pulling out preventing position to the passage allowing position, the movable member further includes an interfering portion and an engaging portion disposed outside a terminal arrangement range in the terminal arrangement direction, the interfering portion is configured to interfere with the flat conductive member when the flat conductive member is inserted into the electrical connector so that the movable member is moved to the passage allowing position, and the engaging portion is configured to engage with an engaged portion (C2A) formed in the flat conductive member at the pulling out preventing position when the flat conductive member is completely inserted into the electrical connector, wherein said movable member further includes a rotational axis portion so that the movable member is movable around the rotational axis portion between the passage allowing position and the pulling out preventing position, characterized in that the operation portion is disposed opposite to the display portion relative to the rotational axis portion and in that the display portion protrudes from said outer surface in the pulling out preventing position, but does not protrude from said outer surface in the passage allowing position.