Chief Metropolitan Magistrate (CMM) Sanjay Bansal said prima facie defamation charges are made out against Kejriwal and put him on trial after he pleaded not guilty.
The cour fixed January 18, 2014, for recording of evidence in the case.
Complainant Pawan Khera, Officer on Special Duty and Political Secretary of Dikshit, had filed the defamation case against Kejriwal saying he had used "false and filthy" language against the Chief Minister in a television show.
"By use of the said word..., you defamed complainant Khera who has been working as OSD/Political Secretary to Sheila Dikshit. You spoke the said word... Intending to harm, or knowing or having reason to believe that such imputations will harm the reputation of complainant Khera and thus you defamed complainant and thereby you committed offence punishable under Section 500 (defamation) of the IPC and within my cognizance.
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"Show cause why you should not be punished for the offence or do you have any defence to make," the CMM said.
"The complainant is not an aggrieved person and has no locus standi to file this complaint. The complainant is not a member of Congress Party nor he has disclosed in clear terms his relationship with Sheila Dikshit. There are proofs available in public domain showing that electricity distribution companies were given unexplainable benefits.
"My accusation is well covered under exceptions first, second, third and ninth of Section 499 of the IPC. I have placed on record my detailed application in my defence. I also seek leave of this court to take any other defence available to me. This complaint against me is false," Kejriwal said.