[Problem] The invention provides a shield case with a reduced dimension in a first direction in three-dimensional state and with a larger space in the first direction between adjacent holding plates in planar development state. [solution] A first shell 400 of a shield case S includes a first base 410a and a second base 420a arranged side-by-side, and a center plate 430a, a first inner plate 440a, a second inner plate 450a, a first holding plate 460a, and a second holding plate 470a. The center plate 430a is arranged on the Z-direction side relative to the first base 410a and the second base 420a. The first inner plate extends from a first end 411a of the first base 410a to a first end 431a of the center plate 430a. The second inner plate 450a extends from a first end 421a of the second base 420a to a second end 432a of the center plate 430a. The first holding plate 460a is integral and contiguous with a second end 412a of the first base 410a. The second holding plate 470a is integral and contiguous with a second end 422a of the second base 420a.