A connector system is a connector system including a plug section, and a receptacle section having a concave portion in an inside of which the plug section can be inserted, wherein the plug section includes a flange portion including a first inclined surface portion which increases in diameter toward an extraction direction, and a second inclined surface portion which decreases in diameter toward the extraction direction on an extraction direction side of the first inclined surface portion, and the receptacle section includes a ball which is placed to be projectable/retractable from a side surface portion of the concave portion, and to be capable of abutting on the first inclined surface portion and the second inclined surface portion of the flange portion when the plug section is inserted, and an urging member which urges the ball in a direction to project into the concave portion from the side surface portion.
