Aqueous developer for flexographic printing plate and manufacturing method of flexographic printing plate

An aqueous developer for a flexographic printing plate, comprising:

• a surfactant represented by Formula (1);
• and
• water,
• here, in Formula (1),
• Ar represents an m-valent aromatic group and m represents an integer of 1 to 8,
• X represents a monovalent organic group and p represents an integer of 0 to 3, which is smaller than m,
• in a case where p is 2 or 3, a plurality of X's may be the same or different from each other,
• A represents an alkylene group having 2 to 4 carbon atoms, R represents a hydrogen atom or an anionic group, and n represents an integer of 1 to 100,
• in a case where n is an integer of 2 to 100, a plurality of A's may be the same or different from each other, and
• in a case where m−p is an integer of 2 to 6, a plurality of A's, n's, and R's may all be the same or different from each other.