PROBLEM TO BE SOLVED: To provide a compound having a high active carboxyl group capable of efficiently reacting with a variety of functional groups and the like, capable of introducing a phosphorylcholine-like group onto various substrate surfaces, and capable of giving functionality of the group, and a process for production thereof.SOLUTION: A carboxyl group including phosphorylcholine compound is shown by a formula (1) (in the formula, M represents H or Na), and can be used as a compound introducing a phosphorylcholine-like group onto the surface of various base materials such as medical instruments, raw materials of cosmetics and chemicals, or raw materials thereof.
