Hi
If I read
http://doc.qt.io/qt-4.8/stylesheet-reference.html#list-of-properties

It says that
text-align
only supported for QPushButton and QProgressBar.

Cannot find any sign that it has changed for 5.5

So its via Delegate or the model.

https://forum.qt.io/topic/11625/solved-text-alignment-in-qtableview-cell/4