びっくりするほど

adverb, noun which may take the genitive case particle 'no'

surprisingly; astonishingly; wonderfully

Expresses that something is so much so that it causes surprise; often used with adjectives or verbs to mean 'surprisingly ~' or 'so ~ that one is amazed'.

• このケーキはびっくりするほどおいしい。

  This cake is surprisingly delicious.

• 彼かれはびっくりするほど早はやく走はしる。

  He runs astonishingly fast.