Moisture adsorbent, sheet-like material for dehumidification, and filter material for dehumidification

Disclosed are: a moisture adsorbent which can adsorb a large amount of moisture in all of a high-moisture atmosphere, a moderate-moisture atmosphere and a low-moisture atmosphere, has a structure that cannot be disrupted by a moisture-absorbable salt, and can be regenerated at a low temperature; and a sheet-like material for dehumidification and a filter material for dehumidification, each of which comprises the moisture adsorbent. Specifically disclosed are: a moisture adsorbent comprising an amorphous aluminum silicate having an Si/Al ratio of 0.7 to 1 and also having peaks at around -78 ppm and -87 ppm in 29 Si solid NMR spectra and a moisture-absorbable salt; and a sheet-like material for dehumidification and a filter material for dehumidification, each of which comprises the moisture adsorbent.