Switch

A switch comprising:

• a base including a recessed portion on one surface of the base;
• a click spring having a dome shape, the click spring being provided at the recessed portion such that the bottom of the recessed portion is contacted at a dome-shaped opening side of the click spring;
• a cover provided to cover the recessed portion and to house the click spring at the recessed portion;
• and
• a strain detecting element attached to another surface of the base,
• wherein the strain detecting element is configured to
• detect strain of the base, the strain occurring in accordance with a depression amount of the click spring that is depressed, and
• output an amount of the detected strain, the amount of the detected strain increasing in accordance with an increase in the depression amount of the click spring, upon occurrence of a condition in which the amount of the detected strain exceeds a threshold.