Jubilee had nominated him to the East African Legislative Assembly but he did not make it.
The EACJ is one of the organs of the East African Community (EAC) established under Article 9 of the Treaty for the Establishment of the EAC.
Its main purpose is to ensure adherence to law in the interpretation and application of and compliance with the Treaty.
Mr Nyachae, running on Jubilee ticket, lost the Kisii senatorial seat to Prof Sam Ongeri of ODM in the August poll, and his appointment may largely be seen as a reward by Jubilee.
The former CIC boss will formally take office July 1, 2018.
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