Contains some …

Useful, but it doesn't tell the whole story.

Also spotted as

卵tamago

egg (mandatory)

乳成分nyuseibun

milk (mandatory)

えび・かにebi, kani

shrimp, crab (mandatory)

ゼラチン・さば・豚肉…

gelatine, mackerel, pork… (optional)

Where it hides

At the end of the ingredient list, in brackets: （一部に乳成分・小麦・大豆を含む）.