Disclosed is an emulsifier for water-in-oil emulsion fuels, which enables formation of a water-in-oil emulsion fuel in a uniformly dispersed stable emulsified state wherein re-separation between oil and water does not occur for a long time. The emulsifier for water-in-oil emulsion fuels contains the following components (1)-(7). (1) Heavy oil A: not less than 50 ml 100 ml (2) Heavy oil B: not less than 100 ml 200 ml (3) Heavy oil C: not less than 300 ml 450 ml (4) Methanol: not less than 100 ml 150 ml (5) Ethanol: not less than 100 ml 200 ml (6) Palm oil: not less than 100 ml 150 ml (7) Water: not less than 100 ml 200 ml
