Idar State  or Edar, was a native state of India, which formed part of the Mahi Kantha Agency, within the Gujarat Division of Bombay. It has an area of 1669 m²., and a population (1901) of 168,557, showing a decrease of 44% in the decade as the result of famine. Estimated gross revenue, £29,000; tribute to the gaekwar of Baroda, £ 2000. In 1901 the raja and his posthumous son both died, and the succession devolved upon Pratap Singh of Idar (q.v.) of Jodhpur. The line of railway from Ahmedabad through Parantij runs mainly through this state. Much of the territory is held by kinsmen of the raja on feudal tenure. The products are grain, oil-seeds and sugar-cane. The town of Idar is 64 m. N.E. of Ahmedabad. Pop. (1901) 7085. It was formerly the capital, but Ahmednagar (to the east of Himatnagar, pop. 3200) was the capital by the end of the British Raj.
In 1941 Idar had a population of 307,798.
Idar was ruled by Rajputs. In 1924 it was made part of the Western India States Agency. It was transferred to the Rajputana States in the early 1940s. In 1949 it was dissolved and split between Sabar Kantha district and Mehsana district which were at that point in Bombay State. Both these districts were included in Gujarat when it was formed in 1960.
Rulers of Idar 
..II. Maharajadhiraja Maharaja Sri Shivsinhji (1736–1791), r. 1751-1791. His second son founded a separate branch of the dynasty, which ruled as Maharajas of Ahmednagar from 1792 until 1843, when Takht Singh, the last Maharaja, became Maharaja of Jodhpur and continued the Ahmednagar line from there.
..III. Maharajadhiraja Maharaja Sri Bhawansinhji (1755–1792), r. 1791-1792
..IV.Maharajadhiraja Maharaja Sri Ganbhirsinhji (1781-12 August 1833), r. 1792-1833
..V. Maharajadhiraja Maharaja Sri Sir Jawansinhji Ganbhirsinhji, KCSI (1830-26 December 1868), r. 12 August 1833-26 December 1868.
..VI. Maharajadhiraja Maharaja Sri Sir Keshrisinji Jawansinhji, KCSI (1864-February 1901), r. 26 December 1868-February 1901.
Interregnum from February–October 1901
..VI.Maharajadhiraja Maharaja Sri Krishnasinhji Keshrisinhji (October 1901-30 November 1901), r. October-30 November 1901. A posthumous son of Sir Keshrisinhji, who "ruled" from his birth, eight months after his father's death, to his own death a month later.
..IX. Colonel Maharajadhiraja Maharaja Sri Himmat Singh Sahib Bahadur, (2 September 1899-24 November 1960), r. 14 April 1931-24 November 1960.
..X. Maharajadhiraja Maharaja Sri Daljit Singh Sahib Bahadur, (10 July 1917-17 May 1992), r. 24 November 1960-17 May 1992.
..XI. Maharajadhiraja Maharaja Sri Rajendra Singh Daljit Singh Sahib Bahadur, (25 September 1938-), r. 17 May 1992-
- Columbia-Lippincott Gazeteer, p. 824