Applications for Schengen visas must be made at the embassy or consulate of the country the applicant intends to visit or, if they intend to visit more than one country in the Schengen area, the embassy or consulate of the country where they will spend the longest time.
If you intend to visit several countries in the Schengen area for equal lengths of time, you should apply at the embassy or consulate of the country through which you will first enter the Schengen area.