To provide a surfactant in which tense feeling after use does not remain.

The aminocarboxylic acid is represented by formula (1) [wherein R1 is a 1-22C organic group; R2 is a 1-8C organic group; R3 is a hydrogen atom, a methyl group or a group represented by the formula R4(AO)nOCH2 (wherein R4 is a hydrogen atom or a 1-22C organic group; AO is a 2-4C oxyalkylene group; n is an integer of 0-200); M is a hydrogen atom, a metal atom or ammonium; O is an oxygen atom; C is a carbon atom; H is a hydrogen atom; N is a nitrogen atom; m is an integer of 0-6]. The method for producing the aminocarboxylic acid represented by formula (1) comprises a step for reacting a vinyl compound with a polyamine.