A tank fixing apparatus includes: a first band including a first fixed portion fixed to a support member supporting a tank, a first pressing portion extending from the first fixed portion and pressing the tank toward the support member, and a first distal end portion extending from the first pressing portion and not fixed to the support member; an urging portion giving a pressing force for the first band; a first fixing portion fixing the first fixed portion to the support member; a second band including a second fixed portion fixed to the support member or the first band, a second pressing portion extending from the second fixed portion and pressing the tank, and a second distal end portion extending from the second pressing portion and not fixed to the support member; and a second fixing portion fixing the second fixed portion to the support member or the first band.