Power supply socket for halogen lamp, and halogen lamp

A power supply socket allowing electrical connection with a terminal of a halogen lamp when the terminal is inserted therein, the power supply socket comprising:

• a first holder part having a first hole that allows the terminal to pass through;
• a second holder part having a second hole formed at a position where the terminal that has passed through the first hole can be inserted;
• and
• a spring member accommodated at a position between the first hole and the second hole and having a third hole that allows the terminal to pass through,
• the first hole, the second hole, and the third hole having a shape extending in a direction that is different from a direction in which the terminal is inserted or passed through,
• the terminal being turned after being inserted into the second hole, whereby the terminal moves inside the first hole, the second hole, and the third hole, and is fixed when the terminal reaches an outer edge portion of the third hole of the spring member.