To provide an electronic device which is excellent in reliability in a joint part between terminal parts, to provide a method of manufacturing the electronic device, to provide an electro-optical device and to provide an electronic apparatus.

The electronic device 1 includes a first substrate 10 and a second substrate 30, wherein the terminal parts 20 and 32 formed on substrates 10 and 30, respectively, are electrically connected together through a joining material 40 containing conductive particles 42. The terminal part 32 formed on at least one of the substrates 10 and 30 is covered with a conductive layer 33 whose hardness is lower than that of the conductive particle 42.