PURPOSE: To suppress formation of by-products and to obtain the titled compound useful as an ion exchanger, etc., advantageously and in high yield, by using no solvent or an extremely small amount of a solvent, in reacting a specific halide compound with a secondary amine.

CONSTITUTION: A halide compound shown by the formula R1-CH2X [R1 is (substituted)alkyl, (substituted)alkenyl or (substituted)aryl; X is halogen] is reacted with a secondary amine as raw materials in the absence of a solvent or in the presence of ≤10pts.wt., preferably ≤5pts.wt. based on 100pts.wt. total amounts of the halide compound and the secondary amine to give the aimed compound. The reaction is preferably carried out by a method wherein the halide compound is dripped into the secondary amine and the dripping rate of the halide compound is preferably 0.05W1mol/hr based on 1mol secondary amine. The reaction temperature is -80W200°C.