Material containing solid bleaching agent, and detergent composition

A solid bleaching agent-containing material, comprising:

• a first layer containing a solid bleaching agent;
• and a second layer formed of a coating layer,
• wherein the first layer is a core and the second layer surrounds the first layer;
• wherein the second layer is present in the solid bleaching agent-containing material in an amount of 5% by mass or more;
• wherein the coating layer comprises one or more selected from the group consisting of alkali metal salts of aromatic carboxylic acids, alkali metal salts of acyclic dicarboxylic acids, alkali metal salts of acyclic monocarboxylic acids having a carbon number of from 1 to 7, and mixtures thereof;
• and
• wherein the solid bleaching agent is one or more halogen bleaching agents selected from the group consisting of halogenated isocyanuric acids, alkali metal salts of halogenated isocyanuric acids, hydrates of alkali metal salts of halogenated isocyanuric acids, halogenated hydantoins, and mixtures thereof.