Electrical connector

1. An electrical connector for connecting an electrical circuit board and a mating connector, comprising:

a terminal having a connecting portion to be connected to the electrical circuit board and a contact portion to be contacted with the mating connector; and

a housing for holding the terminal,

wherein said housing includes a fixed housing to be attached to the electrical circuit board and a movable housing arranged to be movable relative to the fixed housing,

said terminal includes a fixed side held portion held with the fixed housing, a movable side held portion held with the movable housing, and an elastic portion situated between the fixed side held portion and the movable side held portion,

said housing includes an accommodating space situated between the fixed housing and the movable housing for accommodating the elastic portion,

said elastic portion includes at least a first wave shape portion and a second wave shape portion,

said first wave portion includes a first bent portion and a pair of first extending portions,

said first bent portion is situated above the first extending portions in a height direction of the elastic portion,

said second wave shape portion includes a second bent portion and a pair of second extending portions separated from the first extending portions,

said second bent portion is situated above the second extending portions in the height direction,

said elastic portion includes a third bent portion between the first wave shape portion and the second wave portion so that the elastic portion has an M character shape,

said terminal further includes a fixed side transition portion situated between the elastic portion and the fixed side held portion and a movable side transition portion situated between the elastic portion and the movable side held portion,

and

said fixed side transition portion and said movable side transition portion are situated completely below the third bent portion in the height direction.

2. The electrical connector according to claim 1 , wherein one of said first extending portions is situated between the first bent portion and the second bent portion.

3. The electrical connector according to claim 1 , wherein said bent portion has a first width, and

each of said first extending portions has a second width smaller than the first width.

4. The electrical connector according to claim 1 , wherein said elastic portion includes a first inclined portion extending downwardly from one of the first extending portions, and a second inclined portion extending downwardly from one of the second extending portions,

said first inclined portion is disposed between the first wave shape portion and the fixed side transition portion,

said second inclined portion is disposed between the second wave shape portion and the movable side transition portion, and

said first inclined portion and said second inclined portion are inclined inwardly.

5. The electrical connector according to claim 1 , wherein said first extending portions are configured to extend away from each other with a distance in between decreasing toward the first bent portion, and

said second extending portions are configured to extend away from each other with a distance in between decreasing toward the second bent portion.