The present invention provides a new hydrogen chloride removing agent that exhibits a good hydrogen chloride removal effect at a relatively low temperature. The present invention preferably provides a new hydrogen chloride removing agent for removing hydrogen chloride contained in a hydrogen-chloride-containing gas, such as a pyrolysis gas, a combustion exhaust gas, a dry distillation gas, etc., especially hydrogen chloride contained in a biomass pyrolysis gas. The present invention relates to a hydrogen chloride removing agent characterized by containing a mixture of a calcium carbonate and an imogolite and/or a synthetic imogolite, and relates to a method for removing, by using said hydrogen chloride removing agent, hydrogen chloride contained in a hydrogen-chloride-containing gas, especially hydrogen chloride contained in a biomass pyrolysis gas.