Water-soluble metalworking fluid, metalworking liquid, and metalworking method

A water-soluble metalworking oil agent comprising, the following (A) to (E):

• (A) an α-olefin component consisting of one or more C14 to C16 α-olefins, in a content of 20 mass % or more and 65 mass % or less, wherein at least 40 mass % of the α-olefin composition is a C14 α-olefin;
• (B) at least one selected from the group consisting of a dehydration-condensed fatty acid of ricinoleic acid and a dehydration-condensed fatty acid between a ricinoleic acid dehydration-condensed fatty acid and a carboxylic acid, in a content of 5 mass % or more and 30 mass % or less;
• (C) two or more C9 to C12 compounds selected from the group consisting of a monocarboxylic acid and a dicarboxylic acid, each not containing the component (B), wherein the total amount of (C) is from 10 to 19 mass %;
• (D) an alkylamine (D1) not containing a hydroxyl group and an alkanolamine (D2), each meeting the following (1) to (3),
• (1) a content of the component (D1) is 2 mass % or more and 30 mass % or less,
• (2) a total amount of the component (D) is a neutralization equivalent or more of the components (B) and (C), and
• (3) a ratio of the component (D1) in the component (D) [(D1)/(D1+D2)] is 15 mol % or more and 60 mol % or less;
• and
• (E) at least one nonionic surfactant selected from the group consisting of a monohydric alcohol, a polyhydric alcohol, and derivatives thereof,
• wherein mass % is based on the total mass of the water-soluble metalworking oil agent.