He was the Member of parliament for the Sunyani West constituency in the Brong Ahafo Region of Ghana.

He obtained a Bachelor of Science degree at the University of Cape Coast.

[2] He has done much work to facilitate rural development in Ghana, particularly with the mining of salt and diamonds.

He therefore represented the Sunyani West constituency in the 3rd parliament of the 4th republic of Ghana.

He was elected over Kwadwo Nyamekye-Marfo of the National Democratic Congress, Kwaku Twumasi-Ankrah of the Convention People's Party, Kyei-Mensah Monica of the National Reform Party, Patrick Obeng-Mensah an independent candidate and Wilberforce Nabita Amoah of People's National Convention.

In all, the New Patriotic Party won a majority total of 100 parliamentary representation out of 200parliamentary seats in the 3rd parliament of the 4th republic of Ghana.

[5][6] Adjei-Darko was, re-elected as the Member of Parliament for the Sunyani West constituency in the 2008 Ghanaian general elections.