５件
How to write Japanese & Stroke order

Check also 件  

Names and idioms with total stroke of 6:
平一  万川  りつ子  叱る  立っ  

Names and idioms similar to ５件:
重要案件  前提条件  京大事件  能面殺人事件  変事件  

Check stroke order for the words below:
下生  笑府  空枝  七村滝寺  御小人  本家争  揚眉吐気  東北大学