An electricity-supplying connector comprising: an engagement mechanism for engaging with an electricity-receiving connector of an object to be charged, the engagement mechanism having a first engaging member and a second engaging member; and an indicator member characterized in that the indicator member is movable between a charging-disabled position, in which the indicator member is engaged with the engagement mechanism, and a charging-enabled position, in which the indicator member is disengaged with the engagement mechanism; the first engaging member has, at one end, a first active-engagement part adapted for engaging with a first passive-engagement part of the indicator member in a case where the indicator member is in the charging-disabled position, and, at the other end, a contact part adapted for contacting the electricity-receiving connector in a case where the electricity-supplying connector is attached to the electricity-receiving connector, the second engaging member has, at one end, a second active-engagement part adapted for engaging with a second passive-engagement part of the electricity-receiving connector in a case where the electricity-supplying connector is attached to the electricity-receiving connector, and, at the other end, a third active-engagement part adapted for engaging with a third passive-engagement part of the indicator member in a case where the indicator member is in the charging-disabled position, while the electricity-supplying connector is attached to the electricity-receiving connector in a case where the indicator member is held in the charging-disabled position by engaging with the first engaging member or the second engaging member, the first engaging member and the indicator member disengage after the second engaging member and the indicator member have engaged, in a case where the electricity-supplying connector and the electricity-receiving connector continue to be attached and completely engage, the second engaging member and the indicator member disengage such that the indicator member is adapted to indicate that engagement is complete by moving from the charging-disabled position to the charging-enabled position, and the indicator member is elastically biased toward the charging-enabled position. an engagement mechanism for engaging with an electricity-receiving connector of an object to be charged, the engagement mechanism having a first engaging member and a second engaging member; and an indicator member characterized in that the indicator member is movable between a charging-disabled position, in which the indicator member is engaged with the engagement mechanism, and a charging-enabled position, in which the indicator member is disengaged with the engagement mechanism; the first engaging member has, at one end, a first active-engagement part adapted for engaging with a first passive-engagement part of the indicator member in a case where the indicator member is in the charging-disabled position, and, at the other end, a contact part adapted for contacting the electricity-receiving connector in a case where the electricity-supplying connector is attached to the electricity-receiving connector, the second engaging member has, at one end, a second active-engagement part adapted for engaging with a second passive-engagement part of the electricity-receiving connector in a case where the electricity-supplying connector is attached to the electricity-receiving connector, and, at the other end, a third active-engagement part adapted for engaging with a third passive-engagement part of the indicator member in a case where the indicator member is in the charging-disabled position, while the electricity-supplying connector is attached to the electricity-receiving connector in a case where the indicator member is held in the charging-disabled position by engaging with the first engaging member or the second engaging member, the first engaging member and the indicator member disengage after the second engaging member and the indicator member have engaged, in a case where the electricity-supplying connector and the electricity-receiving connector continue to be attached and completely engage, the second engaging member and the indicator member disengage such that the indicator member is adapted to indicate that engagement is complete by moving from the charging-disabled position to the charging-enabled position, and the indicator member is elastically biased toward the charging-enabled position.