The present invention provides a cellulose powder or the like, the cellulose powder comprising cellulose particles having an average particle diameter of 45 mm or less, wherein particles remaining on a sieve with an opening size of 20 mm and passing through a sieve with an opening size of 45 mm are contained more than 40% by mass with respect to the total amount of the powder.本發明提供一種纖維素粉體之平均粒徑為45 μm以下,且通過網眼45 μm之篩而殘留於網眼20 μm之篩上之粒子之比率相對於粉末總量超過40質量%之纖維素粉末等。