A slide device for an electronic device includes a substrate including a substrate including a pair of side edges; an intermediate plate including a pair of sandwiching portions slidably sandwiching the pair of side edges in the front and back direction, respectively, and a pair of outer edges at outer sides of the side edges in the width direction, respectively; a slide plate including a pair of outer sandwiching portions slidably sandwiching the pair of outer edges in the front and back direction, respectively; an intermediate housing position defining portion that protrudes an outer side in the width direction from the front end portion of the outer edge for defining an intermediate housing position of the slide plate with respect to the intermediate plate; an intermediate using position defining portion that protrudes the outer side in the width direction from the back end portion of the outer edge for defining an intermediate using position of the slide plate with respect to the intermediate plate; a housing position defining portion that protrudes in an upper direction of an upper and lower direction at a front portion of the substrate for defining a housing position of the intermediate plate with respect to the substrate; and a using position defining portion that protrudes in the upper direction at a back portion of the substrate for defining a using position of the intermediate plate with respect to the substrate.