A male and female connection structure includes a female terminal, and a male terminal to electrically connect to the female terminal by being inserted into a connection position of the female terminal and to electrically disconnect from the female terminal by being withdrawn from the connection position. The female terminal includes a dimple to electrically connect to the male terminal, a male terminal pressing spring disposed opposite the dimple for pressing the male terminal to be inserted on the dimple against the dimple, and a press switching part for switching between a non-pressed state that the male terminal pressing spring does not press the male terminal located in the female terminal and a pressed state that the male terminal pressing spring presses the male terminal located in the female terminal by changing a shape of the male terminal pressing spring. The press switching part switches the non-pressed state to the pressed state, when the male terminal is inserted into the connection position, by using an insertion force applied when the male terminal is inserted into the female terminal, and it switches the pressed state to the non-pressed state, when the male terminal is withdrawn from the connection position, by using a withdrawal force applied when the male terminal is withdrawn from the female terminal.