Tomar was held in a fake educational degree case in June last year, while Kondli legislator Manoj Kumar was apprehended in July in connection with a land fraud case.
Aam Aadmi Party legislator from Vikaspuri Mahinder Yadav was held on Friday under various charges, including rioting and allegedly assaulting a government official.
Yadav was arrested while he was protesting against Delhi Police for not filing an FIR in a case of rape of a minor girl.
He was produced before the Tis Hazari court, which sent him to one day police custody.
Yadav the sixth AAP lawmaker Delhi to be arrested. Earlier MLAs Akhilesh Tripathi, Somnath Bharti, Commando Surinder Singh, Manoj Kumar and former law minister Jitender Singh Tomar were held on various charges.
In November 2015, Tripathi was held in a 2013 case of rioting and criminal intimidation and sent to judicial custody for two days.
Singh, AAP's MLA from Delhi Cantonment, was arrested last August for allegedly assaulting an NDMC employee, but was granted bail later.
Tomar was held in a fake educational degree case in June last year, while Kondli legislator Manoj Kumar was apprehended in July in connection with a land fraud case.
Bharti was arrested in September last year after he surrendered in connection with the attempt to murder and domestic violence case filed by his wife.
According to the police, Yadav led a violent protest in the Nihal Vihar area in West Delhi following sexual assault on a three-year-old girl and the mob even attacked public vehicles and tried to set a vehicle on fire.
The protesters demanded immediate arrest of the 38-year-old accused and alleged that police was not not taking any action.
"A case was registered last night and the MLA was arrested around 12 noon today under charges of rioting, arson, assault on public servant, wrongful restraint and damage to public property," a senior Delhi police official said, adding that several others were also detained for manhandling a police team that was trying to pacify the agitators.
The AAP blamed the Delhi police for deliberately targeting the ruling party's legislators.
AAP's Delhi Convener Dilip Pandey tweeted, "Delhi Police busy again arresting AAP MLA instead of ensuring Delhi women safety despite multiple warnings from courts." "MLA Mahendra Yadav arrested, for what? He was there where public was protesting against rape of a girl child? Is it wrong to ask for justice?" he said.
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