Tesis ini membahas alasan hukum. Pengadilan Negeri dalam membatalkan putusan-putusan KPPU tentang persekongkolan tender, Berdasarkan Putusan Pengadilan Tinggi Medan dalam Putusan No. 455/Pdt.G/2007/PN.Mdn. dan Putusan No. 430/Pdt.G/2007/PN.Mdn., memutuskan putusan keberatan terhadap perkara No. 05/KPPU-U2007 tentang tender pengerukan alur pelabuhan Belawan dan perkara No. 031KPPU-U2007 tentang tender Pembangunan Gedung Kantor PengadiJan Negeri di Padangsidimpuan, yang membatalkan putusan-putusan KPPU. Dalam pengambilan keputusan. Hakim Pengadilan Negeri tidak menggunakan Pedoman Pasal 22 UU No. S tabun 1999 yang telab di tetapkan oleh KPPU. Kemudian Pengadilan memandang tidak teljadi persekongkolan tender yang bersifat horizontal daan vertikal diantara pelaku usaha dan panitia tender. Penelitian ini menggunakan metode penelitian yuridis normatif dengan data sekunder sebagai smnber datanya, yang diperoleh melalui studi dokumen. Hasil penelitian ini menyarankan perlu ditingkatkan pemahaman dan kemampuan para Hakim Pengadilan Negeri dalam memutuskan perkara keberatan yang terkait dengan kasus tentang persekongkolan tender, agar dalam mengambil keputosan sesuai dengan Pedoman Pasal 22 UU No. 5 tahun 1999 yang telah di susun oleh KPPU.

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This thesis discusses the legal reasons by District Court in canceling KPPU decisions for tender conspiracy, based on Medan High Court District Decisions in the Decision No. 455/Pdt.G/2007/PN.Mdn and Decision No. 430/Pdt.G/2007/PN.Mdn deciding objection decision on the case No. 051KPPUU2007 for Belawan seaport line reclamation tender and case No. 03/KPPUU2007 for tender of High Court Office Building Development in Padangsidempuan, canceling KPPU's decisions. In that decision taking, the Judge of District Court did not use the Manual in Article 22 the Laws No. 5 year 1999, which has already been decided by KPPU. Then the Court deems that there had been no tender conspiracy horizontally and vertically between the business actors and tender committee. This research uses juridical nonnative research method with secondmy data as its primary data source, obtained through docmnent study. The results of this research reconnnend the need of improvement on the understanding and capability of Judges in the District Cowt in resolving on objection case related to the case on tender conspiracy, in order for them in their decision taking should be pursuant to the Manual in Article 22 the Laws No. 5 year 1999, which has been compiled by KPPU.