Method for Manufacturing Joint Member and Joint Member

A method for manufacturing a joint member in which a carbon fiber composite material containing a thermoplastic resin as a matrix and a metal are joined, the method comprising:

• treating a surface of the metal to be joined to the carbon fiber composite material with a solution containing a triazine thiol derivative represented by the following general formula (1);
• providing a thermoplastic resin layer having a thickness of 5 μm to 5 mm between the surface of the metal treated with the solution containing the triazine thiol derivative and the carbon fiber composite material;
• and)
• melting the thermoplastic resin layer by heating to combine the metal and the carbon fiber composite material into one-piece:
• wherein, in the general formula (1),
• R is —OR1, —OOR1, —SmR1, or NR1R2 where R1 and R2 are each independently H, a hydroxyl group, a carbonyl group, an ether group, an ester group, an amide group, an amino group, a phenyl group, an alkyl group having 1 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkenyl group, or a cycloalkyl group having 6 to 10 carbon atoms, m means 1 or 2;
• and
• M is H, Na, Li, K, Ba, Ca, or ammonium, and two M groups in the general formula (1) may be the same or different from each other.