which is not covered by a layer of composite material that is the portion in which each of the above mentioned electrodes is to be formed is shown free of dots next by plating metal materials such as ag cu etc on the external surface of the above mentioned electronic part body 12 the chip type dielectric antenna 11 shown in fig5 and 6 is obtained in this case the portion not covered by a layer of composite material is plated but the portion covered by a layer of composite material is not capable of being plated accordingly as in the case of the first preferred embodiment without using any mask each of the electrodes is able to be easily formed by plating the third preferred embodiment is to be applied to a coil part referring to fig1 the coil part 31 is composed of a coil shaped electrode 33 formed on the external surface of a cylindrical electronic part 32 the electronic part 32 is made up of a composite material of synthetic resin with magnetic ceramic powder dispersed therein as the synthetic resin for example polyphenylene sulphide lcp etc can be used although they are not particularly limited thereto further as the magnetic ceramic powder appropriate ferrite powders such as the nizn group mnzn group etc is able to be preferably used although they are not particularly.