Gaschromic light control element

A gas chromic light-modulation element capable of reversibly changing between a transparent state by hydrogenation and a light-shielding state by dehydrogenation,

• the gas chromic light-modulation element comprising:
• a light-modulation substrate having a light-modulation portion provided on one principal surface of a first transparent substrate, the light-modulation portion including a light-modulation layer capable of reversibly changing light transmittance by hydrogenation and dehydrogenation;
• and
• a second transparent substrate disposed so as to face the light-modulation portion of the light-modulation substrate,
• wherein at least one of the first transparent substrate and the second transparent substrate is flexible, and
• a plurality of dot-shaped spacers are arranged between the light-modulation portion and the second transparent substrate, and a number density of the spacers is 70 pieces/m2 or more.