Polyester type powder coating composition

A polyester type powder coating composition comprising a polyester comprising as main ester-constituting monomer units, (1) at least one polycarboxylic acid component containing at least 10 mole %, based on the polycarboxylic acid component, of at least one aromatic polycarboxylic acid component (A) and (2) at least one polyhydric alcohol component, said polyester having in its main chain at least one terminal blocked with a monofunctional unsaturated alicyclic compound component (B) which is a monohydric alcohol component of a compound represented by the following formula and/or its derivative wherein at least one hydrogen atom of its tricyclodecene ring is substituted with an alkyl group having 1 to 3 carbon atoms or halogen:

• ##STR18## wherein R.sub.1 and R.sub.2 each stand for a hydrogen atom or an alkyl group having 1 to 3 carbon atoms and R.sub.3 stands for a straight-chain or branched alkylene group having 1 to 10 carbon atoms or a divalent residue having at least one member selected from an ether linkage, an ester linkage, an urethane linkage, amide linkage, thioether linkage and sulfone linkage, and a straight-chain or branched alkylene group having 1 to 10 carbon atoms and/or phenylene group, and the total of the carbon atoms of R.sub.1, R.sub.2 and R.sub.3 is 0 to 19, and said polyester having a softening point of 30.degree. to 150.degree. C.