The hearing will last for 20 days.
One of the six accused is a man who, according to a medical certificate to the Swedish Social Insurance Agency, cannot walk more than a few meters indoors.
But the police have spied on the man and filmed how he moves for his own machine and takes a bus to Arlanda and then flies on a trip abroad.
The others who are accused have acted as assistants to the man.
They are acquainted with the man and two of them are his own children.
The suspicions against the assistants consist of the fact that they reported time when they assisted the man, when - according to the prosecutor - they did completely different things, for example being in another place or in another country.
Hear the prosecutor, Elisabeth Anderson, tell about the prosecution:
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Medical certificate said that the man was in a wheelchair - the prosecutor makes a different assessment Photo: Johan Dernelius / Archive Photography, Samuel Boström / SVT